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| <article class="doc"> |
| <h1 class="page">cassandra.yaml file configuration</h1> |
| <div class="sect1"> |
| <h2 id="cluster_name"><a class="anchor" href="#cluster_name"></a><a class="link" href="#cluster_name"><code>cluster_name</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The name of the cluster. This is mainly used to prevent machines in |
| one logical cluster from joining another.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 'Test Cluster'</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="num_tokens"><a class="anchor" href="#num_tokens"></a><a class="link" href="#num_tokens"><code>num_tokens</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This defines the number of tokens randomly assigned to this node on the ring |
| The more tokens, relative to other nodes, the larger the proportion of data |
| that this node will store. You probably want all nodes to have the same number |
| of tokens assuming they have equal hardware capability.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you leave this unspecified, Cassandra will use the default of 1 token for legacy compatibility, |
| and will use the initial_token as described below.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Specifying initial_token will override this setting on the node’s initial start, |
| on subsequent starts, this setting will apply even if initial token is set.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you already have a cluster with 1 token per node, and wish to migrate to |
| multiple tokens per node, see <a href="http://wiki.apache.org/cassandra/Operations" class="bare">wiki.apache.org/cassandra/Operations</a></p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 256</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="allocate_tokens_for_keyspace"><a class="anchor" href="#allocate_tokens_for_keyspace"></a><a class="link" href="#allocate_tokens_for_keyspace"><code>allocate_tokens_for_keyspace</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Triggers automatic allocation of num_tokens tokens for this node. The allocation |
| algorithm attempts to choose tokens in a way that optimizes replicated load over |
| the nodes in the datacenter for the replication strategy used by the specified |
| keyspace.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The load assigned to each node will be close to proportional to its number of |
| vnodes.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Only supported with the Murmur3Partitioner.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> KEYSPACE</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="initial_token"><a class="anchor" href="#initial_token"></a><a class="link" href="#initial_token"><code>initial_token</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>initial_token allows you to specify tokens manually. While you can use it with |
| vnodes (num_tokens > 1, above) — in which case you should provide a |
| comma-separated list — it’s primarily used when adding nodes to legacy clusters |
| that do not have vnodes enabled.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="hinted_handoff_enabled"><a class="anchor" href="#hinted_handoff_enabled"></a><a class="link" href="#hinted_handoff_enabled"><code>hinted_handoff_enabled</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>See <a href="http://wiki.apache.org/cassandra/HintedHandoff" class="bare">wiki.apache.org/cassandra/HintedHandoff</a> |
| May either be "true" or "false" to enable globally</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> true</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="hinted_handoff_disabled_datacenters"><a class="anchor" href="#hinted_handoff_disabled_datacenters"></a><a class="link" href="#hinted_handoff_disabled_datacenters"><code>hinted_handoff_disabled_datacenters</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>When hinted_handoff_enabled is true, a black list of data centers that will not |
| perform hinted handoff</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> # - DC1 |
| # - DC2</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="max_hint_window_in_ms"><a class="anchor" href="#max_hint_window_in_ms"></a><a class="link" href="#max_hint_window_in_ms"><code>max_hint_window_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>this defines the maximum amount of time a dead host will have hints |
| generated. After it has been dead this long, new hints for it will not be |
| created until it has been seen alive and gone down again.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 10800000 # 3 hours</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="hinted_handoff_throttle_in_kb"><a class="anchor" href="#hinted_handoff_throttle_in_kb"></a><a class="link" href="#hinted_handoff_throttle_in_kb"><code>hinted_handoff_throttle_in_kb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum throttle in KBs per second, per delivery thread. This will be |
| reduced proportionally to the number of nodes in the cluster. (If there |
| are two nodes in the cluster, each delivery thread will use the maximum |
| rate; if there are three, each will throttle to half of the maximum, |
| since we expect two nodes to be delivering hints simultaneously.)</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1024</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="max_hints_delivery_threads"><a class="anchor" href="#max_hints_delivery_threads"></a><a class="link" href="#max_hints_delivery_threads"><code>max_hints_delivery_threads</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Number of threads with which to deliver hints; |
| Consider increasing this number when you have multi-dc deployments, since |
| cross-dc handoff tends to be slower</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="hints_directory"><a class="anchor" href="#hints_directory"></a><a class="link" href="#hints_directory"><code>hints_directory</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Directory where Cassandra should store hints. |
| If not set, the default directory is $CASSANDRA_HOME/data/hints.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> /var/lib/cassandra/hints</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="hints_flush_period_in_ms"><a class="anchor" href="#hints_flush_period_in_ms"></a><a class="link" href="#hints_flush_period_in_ms"><code>hints_flush_period_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How often hints should be flushed from the internal buffers to disk. |
| Will <strong>not</strong> trigger fsync.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 10000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="max_hints_file_size_in_mb"><a class="anchor" href="#max_hints_file_size_in_mb"></a><a class="link" href="#max_hints_file_size_in_mb"><code>max_hints_file_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum size for a single hints file, in megabytes.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 128</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="hints_compression"><a class="anchor" href="#hints_compression"></a><a class="link" href="#hints_compression"><code>hints_compression</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Compression to apply to the hint files. If omitted, hints files |
| will be written uncompressed. LZ4, Snappy, and Deflate compressors |
| are supported.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> # - class_name: LZ4Compressor |
| # parameters: |
| # -</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="batchlog_replay_throttle_in_kb"><a class="anchor" href="#batchlog_replay_throttle_in_kb"></a><a class="link" href="#batchlog_replay_throttle_in_kb"><code>batchlog_replay_throttle_in_kb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum throttle in KBs per second, total. This will be |
| reduced proportionally to the number of nodes in the cluster.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1024</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="authenticator"><a class="anchor" href="#authenticator"></a><a class="link" href="#authenticator"><code>authenticator</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Authentication backend, implementing IAuthenticator; used to identify users |
| Out of the box, Cassandra provides org.apache.cassandra.auth.{AllowAllAuthenticator, |
| PasswordAuthenticator}.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>AllowAllAuthenticator performs no checks - set it to disable authentication.</p> |
| </li> |
| <li> |
| <p>PasswordAuthenticator relies on username/password pairs to authenticate |
| users. It keeps usernames and hashed passwords in system_auth.roles table. |
| Please increase system_auth keyspace replication factor if you use this authenticator. |
| If using PasswordAuthenticator, CassandraRoleManager must also be used (see below)</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> AllowAllAuthenticator</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="authorizer"><a class="anchor" href="#authorizer"></a><a class="link" href="#authorizer"><code>authorizer</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Authorization backend, implementing IAuthorizer; used to limit access/provide permissions |
| Out of the box, Cassandra provides org.apache.cassandra.auth.{AllowAllAuthorizer, |
| CassandraAuthorizer}.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>AllowAllAuthorizer allows any action to any user - set it to disable authorization.</p> |
| </li> |
| <li> |
| <p>CassandraAuthorizer stores permissions in system_auth.role_permissions table. Please |
| increase system_auth keyspace replication factor if you use this authorizer.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> AllowAllAuthorizer</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="role_manager"><a class="anchor" href="#role_manager"></a><a class="link" href="#role_manager"><code>role_manager</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Part of the Authentication & Authorization backend, implementing IRoleManager; used |
| to maintain grants and memberships between roles. |
| Out of the box, Cassandra provides org.apache.cassandra.auth.CassandraRoleManager, |
| which stores role information in the system_auth keyspace. Most functions of the |
| IRoleManager require an authenticated login, so unless the configured IAuthenticator |
| actually implements authentication, most of this functionality will be unavailable.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>CassandraRoleManager stores role data in the system_auth keyspace. Please |
| increase system_auth keyspace replication factor if you use this role manager.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> CassandraRoleManager</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="roles_validity_in_ms"><a class="anchor" href="#roles_validity_in_ms"></a><a class="link" href="#roles_validity_in_ms"><code>roles_validity_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Validity period for roles cache (fetching granted roles can be an expensive |
| operation depending on the role manager, CassandraRoleManager is one example) |
| Granted roles are cached for authenticated sessions in AuthenticatedUser and |
| after the period specified here, become eligible for (async) reload. |
| Defaults to 2000, set to 0 to disable caching entirely. |
| Will be disabled automatically for AllowAllAuthenticator.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="roles_update_interval_in_ms"><a class="anchor" href="#roles_update_interval_in_ms"></a><a class="link" href="#roles_update_interval_in_ms"><code>roles_update_interval_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Refresh interval for roles cache (if enabled). |
| After this interval, cache entries become eligible for refresh. Upon next |
| access, an async reload is scheduled and the old value returned until it |
| completes. If roles_validity_in_ms is non-zero, then this must be |
| also. |
| Defaults to the same value as roles_validity_in_ms.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="permissions_validity_in_ms"><a class="anchor" href="#permissions_validity_in_ms"></a><a class="link" href="#permissions_validity_in_ms"><code>permissions_validity_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Validity period for permissions cache (fetching permissions can be an |
| expensive operation depending on the authorizer, CassandraAuthorizer is |
| one example). Defaults to 2000, set to 0 to disable. |
| Will be disabled automatically for AllowAllAuthorizer.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="permissions_update_interval_in_ms"><a class="anchor" href="#permissions_update_interval_in_ms"></a><a class="link" href="#permissions_update_interval_in_ms"><code>permissions_update_interval_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Refresh interval for permissions cache (if enabled). |
| After this interval, cache entries become eligible for refresh. Upon next |
| access, an async reload is scheduled and the old value returned until it |
| completes. If permissions_validity_in_ms is non-zero, then this must be |
| also. |
| Defaults to the same value as permissions_validity_in_ms.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="credentials_validity_in_ms"><a class="anchor" href="#credentials_validity_in_ms"></a><a class="link" href="#credentials_validity_in_ms"><code>credentials_validity_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Validity period for credentials cache. This cache is tightly coupled to |
| the provided PasswordAuthenticator implementation of IAuthenticator. If |
| another IAuthenticator implementation is configured, this cache will not |
| be automatically used and so the following settings will have no effect. |
| Please note, credentials are cached in their encrypted form, so while |
| activating this cache may reduce the number of queries made to the |
| underlying table, it may not bring a significant reduction in the |
| latency of individual authentication attempts. |
| Defaults to 2000, set to 0 to disable credentials caching.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="credentials_update_interval_in_ms"><a class="anchor" href="#credentials_update_interval_in_ms"></a><a class="link" href="#credentials_update_interval_in_ms"><code>credentials_update_interval_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Refresh interval for credentials cache (if enabled). |
| After this interval, cache entries become eligible for refresh. Upon next |
| access, an async reload is scheduled and the old value returned until it |
| completes. If credentials_validity_in_ms is non-zero, then this must be |
| also. |
| Defaults to the same value as credentials_validity_in_ms.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="partitioner"><a class="anchor" href="#partitioner"></a><a class="link" href="#partitioner"><code>partitioner</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The partitioner is responsible for distributing groups of rows (by |
| partition key) across nodes in the cluster. You should leave this |
| alone for new clusters. The partitioner can NOT be changed without |
| reloading all data, so when upgrading you should set this to the |
| same partitioner you were already using.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Besides Murmur3Partitioner, partitioners included for backwards |
| compatibility include RandomPartitioner, ByteOrderedPartitioner, and |
| OrderPreservingPartitioner.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> org.apache.cassandra.dht.Murmur3Partitioner</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="data_file_directories"><a class="anchor" href="#data_file_directories"></a><a class="link" href="#data_file_directories"><code>data_file_directories</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Directories where Cassandra should store data on disk. Cassandra |
| will spread data evenly across them, subject to the granularity of |
| the configured compaction strategy. |
| If not set, the default directory is $CASSANDRA_HOME/data/data.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> # - /var/lib/cassandra/data</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_directory"><a class="anchor" href="#commitlog_directory"></a><a class="link" href="#commitlog_directory"><code>commitlog_directory</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong> |
| commit log. when running on magnetic HDD, this should be a |
| separate spindle than the data directories. |
| If not set, the default directory is $CASSANDRA_HOME/data/commitlog.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> /var/lib/cassandra/commitlog</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cdc_enabled"><a class="anchor" href="#cdc_enabled"></a><a class="link" href="#cdc_enabled"><code>cdc_enabled</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enable / disable CDC functionality on a per-node basis. This modifies the logic used |
| for write path allocation rejection (standard: never reject. cdc: reject Mutation |
| containing a CDC-enabled table if at space limit in cdc_raw_directory).</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cdc_raw_directory"><a class="anchor" href="#cdc_raw_directory"></a><a class="link" href="#cdc_raw_directory"><code>cdc_raw_directory</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>CommitLogSegments are moved to this directory on flush if cdc_enabled: true and the |
| segment contains mutations for a CDC-enabled table. This should be placed on a |
| separate spindle than the data directories. If not set, the default directory is |
| $CASSANDRA_HOME/data/cdc_raw.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> /var/lib/cassandra/cdc_raw</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="disk_failure_policy"><a class="anchor" href="#disk_failure_policy"></a><a class="link" href="#disk_failure_policy"><code>disk_failure_policy</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Policy for data disk failures:</p> |
| </div> |
| <div class="paragraph"> |
| <p>die |
| shut down gossip and client transports and kill the JVM for any fs errors or |
| single-sstable errors, so the node can be replaced.</p> |
| </div> |
| <div class="paragraph"> |
| <p>stop_paranoid |
| shut down gossip and client transports even for single-sstable errors, |
| kill the JVM for errors during startup.</p> |
| </div> |
| <div class="paragraph"> |
| <p>stop |
| shut down gossip and client transports, leaving the node effectively dead, but |
| can still be inspected via JMX, kill the JVM for errors during startup.</p> |
| </div> |
| <div class="paragraph"> |
| <p>best_effort |
| stop using the failed disk and respond to requests based on |
| remaining available sstables. This means you WILL see obsolete |
| data at CL.ONE!</p> |
| </div> |
| <div class="paragraph"> |
| <p>ignore |
| ignore fatal errors and let requests fail, as in pre-1.2 Cassandra</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> stop</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commit_failure_policy"><a class="anchor" href="#commit_failure_policy"></a><a class="link" href="#commit_failure_policy"><code>commit_failure_policy</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Policy for commit disk failures:</p> |
| </div> |
| <div class="paragraph"> |
| <p>die |
| shut down gossip and Thrift and kill the JVM, so the node can be replaced.</p> |
| </div> |
| <div class="paragraph"> |
| <p>stop |
| shut down gossip and Thrift, leaving the node effectively dead, but |
| can still be inspected via JMX.</p> |
| </div> |
| <div class="paragraph"> |
| <p>stop_commit |
| shutdown the commit log, letting writes collect but |
| continuing to service reads, as in pre-2.0.5 Cassandra</p> |
| </div> |
| <div class="paragraph"> |
| <p>ignore |
| ignore fatal errors and let the batches fail</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> stop</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="prepared_statements_cache_size_mb"><a class="anchor" href="#prepared_statements_cache_size_mb"></a><a class="link" href="#prepared_statements_cache_size_mb"><code>prepared_statements_cache_size_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum size of the native protocol prepared statement cache</p> |
| </div> |
| <div class="paragraph"> |
| <p>Valid values are either "auto" (omitting the value) or a value greater 0.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Note that specifying a too large value will result in long running GCs and possbily |
| out-of-memory errors. Keep the value at a small fraction of the heap.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you constantly see "prepared statements discarded in the last minute because |
| cache limit reached" messages, the first step is to investigate the root cause |
| of these messages and check whether prepared statements are used correctly - |
| i.e. use bind markers for variable parts.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Do only change the default value, if you really have more prepared statements than |
| fit in the cache. In most cases it is not neccessary to change this value. |
| Constantly re-preparing statements is a performance penalty.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Default value ("auto") is 1/256th of the heap or 10MB, whichever is greater</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="thrift_prepared_statements_cache_size_mb"><a class="anchor" href="#thrift_prepared_statements_cache_size_mb"></a><a class="link" href="#thrift_prepared_statements_cache_size_mb"><code>thrift_prepared_statements_cache_size_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum size of the Thrift prepared statement cache</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you do not use Thrift at all, it is safe to leave this value at "auto".</p> |
| </div> |
| <div class="paragraph"> |
| <p>See description of 'prepared_statements_cache_size_mb' above for more information.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Default value ("auto") is 1/256th of the heap or 10MB, whichever is greater</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="key_cache_size_in_mb"><a class="anchor" href="#key_cache_size_in_mb"></a><a class="link" href="#key_cache_size_in_mb"><code>key_cache_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum size of the key cache in memory.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Each key cache hit saves 1 seek and each row cache hit saves 2 seeks at the |
| minimum, sometimes more. The key cache is fairly tiny for the amount of |
| time it saves, so it’s worthwhile to use it at large numbers. |
| The row cache saves even more time, but must contain the entire row, |
| so it is extremely space-intensive. It’s best to only use the |
| row cache if you have hot rows or static rows.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| if you reduce the size, you may not get you hottest keys loaded on startup. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Default value is empty to make it "auto" (min(5% of Heap (in MB), 100MB)). Set to 0 to disable key cache.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="key_cache_save_period"><a class="anchor" href="#key_cache_save_period"></a><a class="link" href="#key_cache_save_period"><code>key_cache_save_period</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Duration in seconds after which Cassandra should |
| save the key cache. Caches are saved to saved_caches_directory as |
| specified in this configuration file.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Saved caches greatly improve cold-start speeds, and is relatively cheap in |
| terms of I/O for the key cache. Row cache saving is much more expensive and |
| has limited use.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Default is 14400 or 4 hours.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 14400</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="key_cache_keys_to_save"><a class="anchor" href="#key_cache_keys_to_save"></a><a class="link" href="#key_cache_keys_to_save"><code>key_cache_keys_to_save</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Number of keys from the key cache to save |
| Disabled by default, meaning all keys are going to be saved</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 100</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="row_cache_class_name"><a class="anchor" href="#row_cache_class_name"></a><a class="link" href="#row_cache_class_name"><code>row_cache_class_name</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Row cache implementation class name. Available implementations:</p> |
| </div> |
| <div class="paragraph"> |
| <p>org.apache.cassandra.cache.OHCProvider |
| Fully off-heap row cache implementation (default).</p> |
| </div> |
| <div class="paragraph"> |
| <p>org.apache.cassandra.cache.SerializingCacheProvider |
| This is the row cache implementation availabile |
| in previous releases of Cassandra.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> org.apache.cassandra.cache.OHCProvider</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="row_cache_size_in_mb"><a class="anchor" href="#row_cache_size_in_mb"></a><a class="link" href="#row_cache_size_in_mb"><code>row_cache_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum size of the row cache in memory. |
| Please note that OHC cache implementation requires some additional off-heap memory to manage |
| the map structures and some in-flight memory during operations before/after cache entries can be |
| accounted against the cache capacity. This overhead is usually small compared to the whole capacity. |
| Do not specify more memory that the system can afford in the worst usual situation and leave some |
| headroom for OS block level cache. Do never allow your system to swap.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Default value is 0, to disable row caching.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 0</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="row_cache_save_period"><a class="anchor" href="#row_cache_save_period"></a><a class="link" href="#row_cache_save_period"><code>row_cache_save_period</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Duration in seconds after which Cassandra should save the row cache. |
| Caches are saved to saved_caches_directory as specified in this configuration file.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Saved caches greatly improve cold-start speeds, and is relatively cheap in |
| terms of I/O for the key cache. Row cache saving is much more expensive and |
| has limited use.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Default is 0 to disable saving the row cache.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 0</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="row_cache_keys_to_save"><a class="anchor" href="#row_cache_keys_to_save"></a><a class="link" href="#row_cache_keys_to_save"><code>row_cache_keys_to_save</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Number of keys from the row cache to save. |
| Specify 0 (which is the default), meaning all keys are going to be saved</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 100</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="counter_cache_size_in_mb"><a class="anchor" href="#counter_cache_size_in_mb"></a><a class="link" href="#counter_cache_size_in_mb"><code>counter_cache_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Maximum size of the counter cache in memory.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Counter cache helps to reduce counter locks' contention for hot counter cells. |
| In case of RF = 1 a counter cache hit will cause Cassandra to skip the read before |
| write entirely. With RF > 1 a counter cache hit will still help to reduce the duration |
| of the lock hold, helping with hot counter cell updates, but will not allow skipping |
| the read entirely. Only the local (clock, count) tuple of a counter cell is kept |
| in memory, not the whole counter, so it’s relatively cheap.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| if you reduce the size, you may not get you hottest keys loaded on startup. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Default value is empty to make it "auto" (min(2.5% of Heap (in MB), 50MB)). Set to 0 to disable counter cache. |
| NOTE: if you perform counter deletes and rely on low gcgs, you should disable the counter cache.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="counter_cache_save_period"><a class="anchor" href="#counter_cache_save_period"></a><a class="link" href="#counter_cache_save_period"><code>counter_cache_save_period</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Duration in seconds after which Cassandra should |
| save the counter cache (keys only). Caches are saved to saved_caches_directory as |
| specified in this configuration file.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Default is 7200 or 2 hours.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 7200</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="counter_cache_keys_to_save"><a class="anchor" href="#counter_cache_keys_to_save"></a><a class="link" href="#counter_cache_keys_to_save"><code>counter_cache_keys_to_save</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Number of keys from the counter cache to save |
| Disabled by default, meaning all keys are going to be saved</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 100</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="saved_caches_directory"><a class="anchor" href="#saved_caches_directory"></a><a class="link" href="#saved_caches_directory"><code>saved_caches_directory</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>saved caches |
| If not set, the default directory is $CASSANDRA_HOME/data/saved_caches.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> /var/lib/cassandra/saved_caches</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cache_load_timeout_seconds"><a class="anchor" href="#cache_load_timeout_seconds"></a><a class="link" href="#cache_load_timeout_seconds"><code>cache_load_timeout_seconds</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Number of seconds the server will wait for each cache (row, key, etc …​) to load while starting |
| the Cassandra process. Setting this to a negative value is equivalent to disabling all cache loading on startup |
| while still having the cache during runtime.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 30</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_sync"><a class="anchor" href="#commitlog_sync"></a><a class="link" href="#commitlog_sync"><code>commitlog_sync</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>commitlog_sync may be either "periodic" or "batch."</p> |
| </div> |
| <div class="paragraph"> |
| <p>When in batch mode, Cassandra won’t ack writes until the commit log |
| has been fsynced to disk. It will wait |
| commitlog_sync_batch_window_in_ms milliseconds between fsyncs. |
| This window should be kept short because the writer threads will |
| be unable to do extra work while waiting. (You may need to increase |
| concurrent_writes for the same reason.)</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> batch</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_sync_batch_window_in_ms"><a class="anchor" href="#commitlog_sync_batch_window_in_ms"></a><a class="link" href="#commitlog_sync_batch_window_in_ms"><code>commitlog_sync_batch_window_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_sync-2"><a class="anchor" href="#commitlog_sync-2"></a><a class="link" href="#commitlog_sync-2"><code>commitlog_sync</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>the other option is "periodic" where writes may be acked immediately |
| and the CommitLog is simply synced every commitlog_sync_period_in_ms |
| milliseconds.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> periodic</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_sync_period_in_ms"><a class="anchor" href="#commitlog_sync_period_in_ms"></a><a class="link" href="#commitlog_sync_period_in_ms"><code>commitlog_sync_period_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 10000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_segment_size_in_mb"><a class="anchor" href="#commitlog_segment_size_in_mb"></a><a class="link" href="#commitlog_segment_size_in_mb"><code>commitlog_segment_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The size of the individual commitlog file segments. A commitlog |
| segment may be archived, deleted, or recycled once all the data |
| in it (potentially from each columnfamily in the system) has been |
| flushed to sstables.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default size is 32, which is almost always fine, but if you are |
| archiving commitlog segments (see commitlog_archiving.properties), |
| then you probably want a finer granularity of archiving; 8 or 16 MB |
| is reasonable. |
| Max mutation size is also configurable via max_mutation_size_in_kb setting in |
| cassandra.yaml. The default is half the size commitlog_segment_size_in_mb * 1024. |
| This should be positive and less than 2048.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| If max_mutation_size_in_kb is set explicitly then commitlog_segment_size_in_mb must |
| be set to at least twice the size of max_mutation_size_in_kb / 1024 |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 32</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_compression"><a class="anchor" href="#commitlog_compression"></a><a class="link" href="#commitlog_compression"><code>commitlog_compression</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Compression to apply to the commit log. If omitted, the commit log |
| will be written uncompressed. LZ4, Snappy, and Deflate compressors |
| are supported.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> # - class_name: LZ4Compressor |
| # parameters: |
| # -</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="seed_provider"><a class="anchor" href="#seed_provider"></a><a class="link" href="#seed_provider"><code>seed_provider</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>any class that implements the SeedProvider interface and has a |
| constructor that takes a Map<String, String> of parameters will do.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> # Addresses of hosts that are deemed contact points. |
| # Cassandra nodes use this list of hosts to find each other and learn |
| # the topology of the ring. You must change this if you are running |
| # multiple nodes! |
| - class_name: org.apache.cassandra.locator.SimpleSeedProvider |
| parameters: |
| # seeds is actually a comma-delimited list of addresses. |
| # Ex: "<ip1>,<ip2>,<ip3>" |
| - seeds: "127.0.0.1"</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="concurrent_reads"><a class="anchor" href="#concurrent_reads"></a><a class="link" href="#concurrent_reads"><code>concurrent_reads</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>For workloads with more data than can fit in memory, Cassandra’s |
| bottleneck will be reads that need to fetch data from |
| disk. "concurrent_reads" should be set to (16 * number_of_drives) in |
| order to allow the operations to enqueue low enough in the stack |
| that the OS and drives can reorder them. Same applies to |
| "concurrent_counter_writes", since counter writes read the current |
| values before incrementing and writing them back.</p> |
| </div> |
| <div class="paragraph"> |
| <p>On the other hand, since writes are almost never IO bound, the ideal |
| number of "concurrent_writes" is dependent on the number of cores in |
| your system; (8 * number_of_cores) is a good rule of thumb.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 32</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="concurrent_writes"><a class="anchor" href="#concurrent_writes"></a><a class="link" href="#concurrent_writes"><code>concurrent_writes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 32</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="concurrent_counter_writes"><a class="anchor" href="#concurrent_counter_writes"></a><a class="link" href="#concurrent_counter_writes"><code>concurrent_counter_writes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 32</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="concurrent_materialized_view_writes"><a class="anchor" href="#concurrent_materialized_view_writes"></a><a class="link" href="#concurrent_materialized_view_writes"><code>concurrent_materialized_view_writes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>For materialized view writes, as there is a read involved, so this should |
| be limited by the less of concurrent reads or concurrent writes.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 32</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="file_cache_size_in_mb"><a class="anchor" href="#file_cache_size_in_mb"></a><a class="link" href="#file_cache_size_in_mb"><code>file_cache_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Maximum memory to use for sstable chunk cache and buffer pooling. |
| 32MB of this are reserved for pooling buffers, the rest is used as an |
| cache that holds uncompressed sstable chunks. |
| Defaults to the smaller of 1/4 of heap or 512MB. This pool is allocated off-heap, |
| so is in addition to the memory allocated for heap. The cache also has on-heap |
| overhead which is roughly 128 bytes per chunk (i.e. 0.2% of the reserved size |
| if the default 64k chunk size is used). |
| Memory is only allocated when needed.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 512</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="buffer_pool_use_heap_if_exhausted"><a class="anchor" href="#buffer_pool_use_heap_if_exhausted"></a><a class="link" href="#buffer_pool_use_heap_if_exhausted"><code>buffer_pool_use_heap_if_exhausted</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Flag indicating whether to allocate on or off heap when the sstable buffer |
| pool is exhausted, that is when it has exceeded the maximum memory |
| file_cache_size_in_mb, beyond which it will not cache buffers but allocate on request.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> true</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="disk_optimization_strategy"><a class="anchor" href="#disk_optimization_strategy"></a><a class="link" href="#disk_optimization_strategy"><code>disk_optimization_strategy</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>The strategy for optimizing disk read |
| Possible values are: |
| ssd (for solid state disks, the default) |
| spinning (for spinning disks)</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> ssd</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="memtable_heap_space_in_mb"><a class="anchor" href="#memtable_heap_space_in_mb"></a><a class="link" href="#memtable_heap_space_in_mb"><code>memtable_heap_space_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Total permitted memory to use for memtables. Cassandra will stop |
| accepting writes when the limit is exceeded until a flush completes, |
| and will trigger a flush based on memtable_cleanup_threshold |
| If omitted, Cassandra will set both to 1/4 the size of the heap.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2048</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="memtable_offheap_space_in_mb"><a class="anchor" href="#memtable_offheap_space_in_mb"></a><a class="link" href="#memtable_offheap_space_in_mb"><code>memtable_offheap_space_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2048</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="memtable_cleanup_threshold"><a class="anchor" href="#memtable_cleanup_threshold"></a><a class="link" href="#memtable_cleanup_threshold"><code>memtable_cleanup_threshold</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>memtable_cleanup_threshold is deprecated. The default calculation |
| is the only reasonable choice. See the comments on memtable_flush_writers |
| for more information.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ratio of occupied non-flushing memtable size to total permitted size |
| that will trigger a flush of the largest memtable. Larger mct will |
| mean larger flushes and hence less compaction, but also less concurrent |
| flush activity which can make it difficult to keep your disks fed |
| under heavy write load.</p> |
| </div> |
| <div class="paragraph"> |
| <p>memtable_cleanup_threshold defaults to 1 / (memtable_flush_writers + 1)</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 0.11</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="memtable_allocation_type"><a class="anchor" href="#memtable_allocation_type"></a><a class="link" href="#memtable_allocation_type"><code>memtable_allocation_type</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Specify the way Cassandra allocates and manages memtable memory. |
| Options are:</p> |
| </div> |
| <div class="paragraph"> |
| <p>heap_buffers |
| on heap nio buffers</p> |
| </div> |
| <div class="paragraph"> |
| <p>offheap_buffers |
| off heap (direct) nio buffers</p> |
| </div> |
| <div class="paragraph"> |
| <p>offheap_objects |
| off heap objects</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> heap_buffers</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="repair_session_max_tree_depth"><a class="anchor" href="#repair_session_max_tree_depth"></a><a class="link" href="#repair_session_max_tree_depth"><code>repair_session_max_tree_depth</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Limits the maximum Merkle tree depth to avoid consuming too much |
| memory during repairs.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default setting of 18 generates trees of maximum size around |
| 50 MiB / tree. If you are running out of memory during repairs consider |
| lowering this to 15 (~6 MiB / tree) or lower, but try not to lower it |
| too much past that or you will lose too much resolution and stream |
| too much redundant data during repair. Cannot be set lower than 10.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For more details see <a href="https://issues.apache.org/jira/browse/CASSANDRA-14096" class="bare">issues.apache.org/jira/browse/CASSANDRA-14096</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 18</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog_total_space_in_mb"><a class="anchor" href="#commitlog_total_space_in_mb"></a><a class="link" href="#commitlog_total_space_in_mb"><code>commitlog_total_space_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Total space to use for commit logs on disk.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If space gets above this value, Cassandra will flush every dirty CF |
| in the oldest segment and remove it. So a small total commitlog space |
| will tend to cause more flush activity on less-active columnfamilies.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default value is the smaller of 8192, and 1/4 of the total space |
| of the commitlog volume.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 8192</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="memtable_flush_writers"><a class="anchor" href="#memtable_flush_writers"></a><a class="link" href="#memtable_flush_writers"><code>memtable_flush_writers</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>This sets the number of memtable flush writer threads per disk |
| as well as the total number of memtables that can be flushed concurrently. |
| These are generally a combination of compute and IO bound.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Memtable flushing is more CPU efficient than memtable ingest and a single thread |
| can keep up with the ingest rate of a whole server on a single fast disk |
| until it temporarily becomes IO bound under contention typically with compaction. |
| At that point you need multiple flush threads. At some point in the future |
| it may become CPU bound all the time.</p> |
| </div> |
| <div class="paragraph"> |
| <p>You can tell if flushing is falling behind using the MemtablePool.BlockedOnAllocation |
| metric which should be 0, but will be non-zero if threads are blocked waiting on flushing |
| to free memory.</p> |
| </div> |
| <div class="paragraph"> |
| <p>memtable_flush_writers defaults to two for a single data directory. |
| This means that two memtables can be flushed concurrently to the single data directory. |
| If you have multiple data directories the default is one memtable flushing at a time |
| but the flush will use a thread per data directory so you will get two or more writers.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Two is generally enough to flush on a fast disk [array] mounted as a single data directory. |
| Adding more flush writers will result in smaller more frequent flushes that introduce more |
| compaction overhead.</p> |
| </div> |
| <div class="paragraph"> |
| <p>There is a direct tradeoff between number of memtables that can be flushed concurrently |
| and flush size and frequency. More is not better you just need enough flush writers |
| to never stall waiting for flushing to free memory.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cdc_total_space_in_mb"><a class="anchor" href="#cdc_total_space_in_mb"></a><a class="link" href="#cdc_total_space_in_mb"><code>cdc_total_space_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Total space to use for change-data-capture logs on disk.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If space gets above this value, Cassandra will throw WriteTimeoutException |
| on Mutations including tables with CDC enabled. A CDCCompactor is responsible |
| for parsing the raw CDC logs and deleting them when parsing is completed.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default value is the min of 4096 mb and 1/8th of the total space |
| of the drive where cdc_raw_directory resides.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 4096</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cdc_free_space_check_interval_ms"><a class="anchor" href="#cdc_free_space_check_interval_ms"></a><a class="link" href="#cdc_free_space_check_interval_ms"><code>cdc_free_space_check_interval_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>When we hit our cdc_raw limit and the CDCCompactor is either running behind |
| or experiencing backpressure, we check at the following interval to see if any |
| new space for cdc-tracked tables has been made available. Default to 250ms</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 250</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="index_summary_capacity_in_mb"><a class="anchor" href="#index_summary_capacity_in_mb"></a><a class="link" href="#index_summary_capacity_in_mb"><code>index_summary_capacity_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>A fixed memory pool size in MB for for SSTable index summaries. If left |
| empty, this will default to 5% of the heap size. If the memory usage of |
| all index summaries exceeds this limit, SSTables with low read rates will |
| shrink their index summaries in order to meet this limit. However, this |
| is a best-effort process. In extreme conditions Cassandra may need to use |
| more than this amount of memory.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="index_summary_resize_interval_in_minutes"><a class="anchor" href="#index_summary_resize_interval_in_minutes"></a><a class="link" href="#index_summary_resize_interval_in_minutes"><code>index_summary_resize_interval_in_minutes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How frequently index summaries should be resampled. This is done |
| periodically to redistribute memory from the fixed-size pool to sstables |
| proportional their recent read rates. Setting to -1 will disable this |
| process, leaving existing index summaries at their current sampling level.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 60</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="trickle_fsync"><a class="anchor" href="#trickle_fsync"></a><a class="link" href="#trickle_fsync"><code>trickle_fsync</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Whether to, when doing sequential writing, fsync() at intervals in |
| order to force the operating system to flush the dirty |
| buffers. Enable this to avoid sudden dirty buffer flushing from |
| impacting read latencies. Almost always a good idea on SSDs; not |
| necessarily on platters.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="trickle_fsync_interval_in_kb"><a class="anchor" href="#trickle_fsync_interval_in_kb"></a><a class="link" href="#trickle_fsync_interval_in_kb"><code>trickle_fsync_interval_in_kb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 10240</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="storage_port"><a class="anchor" href="#storage_port"></a><a class="link" href="#storage_port"><code>storage_port</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>TCP port, for commands and data |
| For security reasons, you should not expose this port to the internet. Firewall it if needed.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 7000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="ssl_storage_port"><a class="anchor" href="#ssl_storage_port"></a><a class="link" href="#ssl_storage_port"><code>ssl_storage_port</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>SSL port, for encrypted communication. Unused unless enabled in |
| encryption_options |
| For security reasons, you should not expose this port to the internet. Firewall it if needed.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 7001</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="listen_address"><a class="anchor" href="#listen_address"></a><a class="link" href="#listen_address"><code>listen_address</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Address or interface to bind to and tell other Cassandra nodes to connect to. |
| You <em>must</em> change this if you want multiple nodes to be able to communicate!</p> |
| </div> |
| <div class="paragraph"> |
| <p>Set listen_address OR listen_interface, not both.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Leaving it blank leaves it up to InetAddress.getLocalHost(). This |
| will always do the Right Thing <em>if</em> the node is properly configured |
| (hostname, name resolution, etc), and the Right Thing is to use the |
| address associated with the hostname (it might not be).</p> |
| </div> |
| <div class="paragraph"> |
| <p>Setting listen_address to 0.0.0.0 is always wrong.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> localhost</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="listen_interface"><a class="anchor" href="#listen_interface"></a><a class="link" href="#listen_interface"><code>listen_interface</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Set listen_address OR listen_interface, not both. Interfaces must correspond |
| to a single address, IP aliasing is not supported.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> eth0</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="listen_interface_prefer_ipv6"><a class="anchor" href="#listen_interface_prefer_ipv6"></a><a class="link" href="#listen_interface_prefer_ipv6"><code>listen_interface_prefer_ipv6</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>If you choose to specify the interface by name and the interface has an ipv4 and an ipv6 address |
| you can specify which should be chosen using listen_interface_prefer_ipv6. If false the first ipv4 |
| address will be used. If true the first ipv6 address will be used. Defaults to false preferring |
| ipv4. If there is only one address it will be selected regardless of ipv4/ipv6.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="broadcast_address"><a class="anchor" href="#broadcast_address"></a><a class="link" href="#broadcast_address"><code>broadcast_address</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Address to broadcast to other Cassandra nodes |
| Leaving this blank will set it to the same value as listen_address</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1.2.3.4</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="listen_on_broadcast_address"><a class="anchor" href="#listen_on_broadcast_address"></a><a class="link" href="#listen_on_broadcast_address"><code>listen_on_broadcast_address</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>When using multiple physical network interfaces, set this |
| to true to listen on broadcast_address in addition to |
| the listen_address, allowing nodes to communicate in both |
| interfaces. |
| Ignore this property if the network configuration automatically |
| routes between the public and private networks such as EC2.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="internode_authenticator"><a class="anchor" href="#internode_authenticator"></a><a class="link" href="#internode_authenticator"><code>internode_authenticator</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Internode authentication backend, implementing IInternodeAuthenticator; |
| used to allow/disallow connections from peer nodes.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> org.apache.cassandra.auth.AllowAllInternodeAuthenticator</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="start_native_transport"><a class="anchor" href="#start_native_transport"></a><a class="link" href="#start_native_transport"><code>start_native_transport</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Whether to start the native transport server. |
| Please note that the address on which the native transport is bound is the |
| same as the rpc_address. The port however is different and specified below.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> true</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="native_transport_port"><a class="anchor" href="#native_transport_port"></a><a class="link" href="#native_transport_port"><code>native_transport_port</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>port for the CQL native transport to listen for clients on |
| For security reasons, you should not expose this port to the internet. Firewall it if needed.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 9042</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="native_transport_port_ssl"><a class="anchor" href="#native_transport_port_ssl"></a><a class="link" href="#native_transport_port_ssl"><code>native_transport_port_ssl</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong> |
| Enabling native transport encryption in client_encryption_options allows you to either use |
| encryption for the standard port or to use a dedicated, additional port along with the unencrypted |
| standard native_transport_port. |
| Enabling client encryption and keeping native_transport_port_ssl disabled will use encryption |
| for native_transport_port. Setting native_transport_port_ssl to a different value |
| from native_transport_port will use encryption for native_transport_port_ssl while |
| keeping native_transport_port unencrypted.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 9142</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="native_transport_max_threads"><a class="anchor" href="#native_transport_max_threads"></a><a class="link" href="#native_transport_max_threads"><code>native_transport_max_threads</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong> |
| The maximum threads for handling requests when the native transport is used. |
| This is similar to rpc_max_threads though the default differs slightly (and |
| there is no native_transport_min_threads, idle threads will always be stopped |
| after 30 seconds).</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 128</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="native_transport_max_frame_size_in_mb"><a class="anchor" href="#native_transport_max_frame_size_in_mb"></a><a class="link" href="#native_transport_max_frame_size_in_mb"><code>native_transport_max_frame_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>The maximum size of allowed frame. Frame (requests) larger than this will |
| be rejected as invalid. The default is 256MB. If you’re changing this parameter, |
| you may want to adjust max_value_size_in_mb accordingly. This should be positive and less than 2048.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 256</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="native_transport_max_concurrent_connections"><a class="anchor" href="#native_transport_max_concurrent_connections"></a><a class="link" href="#native_transport_max_concurrent_connections"><code>native_transport_max_concurrent_connections</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>The maximum number of concurrent client connections. |
| The default is -1, which means unlimited.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> -1</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="native_transport_max_concurrent_connections_per_ip"><a class="anchor" href="#native_transport_max_concurrent_connections_per_ip"></a><a class="link" href="#native_transport_max_concurrent_connections_per_ip"><code>native_transport_max_concurrent_connections_per_ip</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>The maximum number of concurrent client connections per source ip. |
| The default is -1, which means unlimited.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> -1</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="start_rpc"><a class="anchor" href="#start_rpc"></a><a class="link" href="#start_rpc"><code>start_rpc</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Whether to start the thrift rpc server.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_address"><a class="anchor" href="#rpc_address"></a><a class="link" href="#rpc_address"><code>rpc_address</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The address or interface to bind the Thrift RPC service and native transport |
| server to.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Set rpc_address OR rpc_interface, not both.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Leaving rpc_address blank has the same effect as on listen_address |
| (i.e. it will be based on the configured hostname of the node).</p> |
| </div> |
| <div class="paragraph"> |
| <p>Note that unlike listen_address, you can specify 0.0.0.0, but you must also |
| set broadcast_rpc_address to a value other than 0.0.0.0.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For security reasons, you should not expose this port to the internet. Firewall it if needed.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> localhost</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_interface"><a class="anchor" href="#rpc_interface"></a><a class="link" href="#rpc_interface"><code>rpc_interface</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Set rpc_address OR rpc_interface, not both. Interfaces must correspond |
| to a single address, IP aliasing is not supported.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> eth1</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_interface_prefer_ipv6"><a class="anchor" href="#rpc_interface_prefer_ipv6"></a><a class="link" href="#rpc_interface_prefer_ipv6"><code>rpc_interface_prefer_ipv6</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>If you choose to specify the interface by name and the interface has an ipv4 and an ipv6 address |
| you can specify which should be chosen using rpc_interface_prefer_ipv6. If false the first ipv4 |
| address will be used. If true the first ipv6 address will be used. Defaults to false preferring |
| ipv4. If there is only one address it will be selected regardless of ipv4/ipv6.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_port"><a class="anchor" href="#rpc_port"></a><a class="link" href="#rpc_port"><code>rpc_port</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>port for Thrift to listen for clients on</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 9160</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="broadcast_rpc_address"><a class="anchor" href="#broadcast_rpc_address"></a><a class="link" href="#broadcast_rpc_address"><code>broadcast_rpc_address</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>RPC address to broadcast to drivers and other Cassandra nodes. This cannot |
| be set to 0.0.0.0. If left blank, this will be set to the value of |
| rpc_address. If rpc_address is set to 0.0.0.0, broadcast_rpc_address must |
| be set.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1.2.3.4</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_keepalive"><a class="anchor" href="#rpc_keepalive"></a><a class="link" href="#rpc_keepalive"><code>rpc_keepalive</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>enable or disable keepalive on rpc/native connections</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> true</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_server_type"><a class="anchor" href="#rpc_server_type"></a><a class="link" href="#rpc_server_type"><code>rpc_server_type</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Cassandra provides two out-of-the-box options for the RPC Server:</p> |
| </div> |
| <div class="paragraph"> |
| <p>sync |
| One thread per thrift connection. For a very large number of clients, memory |
| will be your limiting factor. On a 64 bit JVM, 180KB is the minimum stack size |
| per thread, and that will correspond to your use of virtual memory (but physical memory |
| may be limited depending on use of stack space).</p> |
| </div> |
| <div class="paragraph"> |
| <p>hsha |
| Stands for "half synchronous, half asynchronous." All thrift clients are handled |
| asynchronously using a small number of threads that does not vary with the amount |
| of thrift clients (and thus scales well to many clients). The rpc requests are still |
| synchronous (one thread per active request). If hsha is selected then it is essential |
| that rpc_max_threads is changed from the default value of unlimited.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default is sync because on Windows hsha is about 30% slower. On Linux, |
| sync/hsha performance is about the same, with hsha of course using less memory.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Alternatively, can provide your own RPC server by providing the fully-qualified class name |
| of an o.a.c.t.TServerFactory that can create an instance of it.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> sync</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_min_threads"><a class="anchor" href="#rpc_min_threads"></a><a class="link" href="#rpc_min_threads"><code>rpc_min_threads</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Uncomment rpc_min|max_thread to set request pool size limits.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Regardless of your choice of RPC server (see above), the number of maximum requests in the |
| RPC thread pool dictates how many concurrent requests are possible (but if you are using the sync |
| RPC server, it also dictates the number of clients that can be connected at all).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default is unlimited and thus provides no protection against clients overwhelming the server. You are |
| encouraged to set a maximum that makes sense for you in production, but do keep in mind that |
| rpc_max_threads represents the maximum number of client requests this server may execute concurrently.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 16</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_max_threads"><a class="anchor" href="#rpc_max_threads"></a><a class="link" href="#rpc_max_threads"><code>rpc_max_threads</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2048</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_send_buff_size_in_bytes"><a class="anchor" href="#rpc_send_buff_size_in_bytes"></a><a class="link" href="#rpc_send_buff_size_in_bytes"><code>rpc_send_buff_size_in_bytes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>uncomment to set socket buffer sizes on rpc connections</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rpc_recv_buff_size_in_bytes"><a class="anchor" href="#rpc_recv_buff_size_in_bytes"></a><a class="link" href="#rpc_recv_buff_size_in_bytes"><code>rpc_recv_buff_size_in_bytes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="internode_send_buff_size_in_bytes"><a class="anchor" href="#internode_send_buff_size_in_bytes"></a><a class="link" href="#internode_send_buff_size_in_bytes"><code>internode_send_buff_size_in_bytes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Uncomment to set socket buffer size for internode communication |
| Note that when setting this, the buffer size is limited by net.core.wmem_max |
| and when not setting it it is defined by net.ipv4.tcp_wmem |
| See also: |
| /proc/sys/net/core/wmem_max |
| /proc/sys/net/core/rmem_max |
| /proc/sys/net/ipv4/tcp_wmem |
| /proc/sys/net/ipv4/tcp_wmem |
| and 'man tcp'</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="internode_recv_buff_size_in_bytes"><a class="anchor" href="#internode_recv_buff_size_in_bytes"></a><a class="link" href="#internode_recv_buff_size_in_bytes"><code>internode_recv_buff_size_in_bytes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Uncomment to set socket buffer size for internode communication |
| Note that when setting this, the buffer size is limited by net.core.wmem_max |
| and when not setting it it is defined by net.ipv4.tcp_wmem</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="thrift_framed_transport_size_in_mb"><a class="anchor" href="#thrift_framed_transport_size_in_mb"></a><a class="link" href="#thrift_framed_transport_size_in_mb"><code>thrift_framed_transport_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Frame size for thrift (maximum message length).</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 15</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="incremental_backups"><a class="anchor" href="#incremental_backups"></a><a class="link" href="#incremental_backups"><code>incremental_backups</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Set to true to have Cassandra create a hard link to each sstable |
| flushed or streamed locally in a backups/ subdirectory of the |
| keyspace data. Removing these links is the operator’s |
| responsibility.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="snapshot_before_compaction"><a class="anchor" href="#snapshot_before_compaction"></a><a class="link" href="#snapshot_before_compaction"><code>snapshot_before_compaction</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Whether or not to take a snapshot before each compaction. Be |
| careful using this option, since Cassandra won’t clean up the |
| snapshots for you. Mostly useful if you’re paranoid when there |
| is a data format change.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="auto_snapshot"><a class="anchor" href="#auto_snapshot"></a><a class="link" href="#auto_snapshot"><code>auto_snapshot</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Whether or not a snapshot is taken of the data before keyspace truncation |
| or dropping of column families. The STRONGLY advised default of true |
| should be used to provide data safety. If you set this flag to false, you will |
| lose data on truncation or drop.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> true</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="column_index_size_in_kb"><a class="anchor" href="#column_index_size_in_kb"></a><a class="link" href="#column_index_size_in_kb"><code>column_index_size_in_kb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Granularity of the collation index of rows within a partition. |
| Increase if your rows are large, or if you have a very large |
| number of rows per partition. The competing goals are these:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>a smaller granularity means more index entries are generated |
| and looking up rows withing the partition by collation column |
| is faster</p> |
| </li> |
| <li> |
| <p>but, Cassandra will keep the collation index in memory for hot |
| rows (as part of the key cache), so a larger granularity means |
| you can cache more hot rows</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 64</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="column_index_cache_size_in_kb"><a class="anchor" href="#column_index_cache_size_in_kb"></a><a class="link" href="#column_index_cache_size_in_kb"><code>column_index_cache_size_in_kb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Per sstable indexed key cache entries (the collation index in memory |
| mentioned above) exceeding this size will not be held on heap. |
| This means that only partition information is held on heap and the |
| index entries are read from disk.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Note that this size refers to the size of the |
| serialized index information and not the size of the partition.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="concurrent_compactors"><a class="anchor" href="#concurrent_compactors"></a><a class="link" href="#concurrent_compactors"><code>concurrent_compactors</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Number of simultaneous compactions to allow, NOT including |
| validation "compactions" for anti-entropy repair. Simultaneous |
| compactions can help preserve read performance in a mixed read/write |
| workload, by mitigating the tendency of small sstables to accumulate |
| during a single long running compactions. The default is usually |
| fine and if you experience problems with compaction running too |
| slowly or too fast, you should look at |
| compaction_throughput_mb_per_sec first.</p> |
| </div> |
| <div class="paragraph"> |
| <p>concurrent_compactors defaults to the smaller of (number of disks, |
| number of cores), with a minimum of 2 and a maximum of 8.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If your data directories are backed by SSD, you should increase this |
| to the number of cores.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="compaction_throughput_mb_per_sec"><a class="anchor" href="#compaction_throughput_mb_per_sec"></a><a class="link" href="#compaction_throughput_mb_per_sec"><code>compaction_throughput_mb_per_sec</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Throttles compaction to the given total throughput across the entire |
| system. The faster you insert data, the faster you need to compact in |
| order to keep the sstable count down, but in general, setting this to |
| 16 to 32 times the rate you are inserting data is more than sufficient. |
| Setting this to 0 disables throttling. Note that this account for all types |
| of compaction, including validation compaction.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 16</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="sstable_preemptive_open_interval_in_mb"><a class="anchor" href="#sstable_preemptive_open_interval_in_mb"></a><a class="link" href="#sstable_preemptive_open_interval_in_mb"><code>sstable_preemptive_open_interval_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When compacting, the replacement sstable(s) can be opened before they |
| are completely written, and used in place of the prior sstables for |
| any range that has been written. This helps to smoothly transfer reads |
| between the sstables, reducing page cache churn and keeping hot rows hot</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 50</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="stream_throughput_outbound_megabits_per_sec"><a class="anchor" href="#stream_throughput_outbound_megabits_per_sec"></a><a class="link" href="#stream_throughput_outbound_megabits_per_sec"><code>stream_throughput_outbound_megabits_per_sec</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Throttles all outbound streaming file transfers on this node to the |
| given total throughput in Mbps. This is necessary because Cassandra does |
| mostly sequential IO when streaming data during bootstrap or repair, which |
| can lead to saturating the network connection and degrading rpc performance. |
| When unset, the default is 200 Mbps or 25 MB/s.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 200</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="inter_dc_stream_throughput_outbound_megabits_per_sec"><a class="anchor" href="#inter_dc_stream_throughput_outbound_megabits_per_sec"></a><a class="link" href="#inter_dc_stream_throughput_outbound_megabits_per_sec"><code>inter_dc_stream_throughput_outbound_megabits_per_sec</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Throttles all streaming file transfer between the datacenters, |
| this setting allows users to throttle inter dc stream throughput in addition |
| to throttling all network stream traffic as configured with |
| stream_throughput_outbound_megabits_per_sec |
| When unset, the default is 200 Mbps or 25 MB/s</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 200</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="read_request_timeout_in_ms"><a class="anchor" href="#read_request_timeout_in_ms"></a><a class="link" href="#read_request_timeout_in_ms"><code>read_request_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Server side timeouts for requests. The server will return a timeout exception |
| to the client if it can’t complete an operation within the corresponding |
| timeout. Those settings are a protection against: |
| 1) having client wait on an operation that might never terminate due to some |
| failures. |
| 2) operations that use too much CPU/read too much data (leading to memory build |
| up) by putting a limit to how long an operation will execute. |
| For this reason, you should avoid putting these settings too high. In other words, |
| if you are timing out requests because of underlying resource constraints then |
| increasing the timeout will just cause more problems. Of course putting them too |
| low is equally ill-advised since clients could get timeouts even for successful |
| operations just because the timeout setting is too tight.</p> |
| </div> |
| <div class="paragraph"> |
| <p>How long the coordinator should wait for read operations to complete</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 5000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="range_request_timeout_in_ms"><a class="anchor" href="#range_request_timeout_in_ms"></a><a class="link" href="#range_request_timeout_in_ms"><code>range_request_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How long the coordinator should wait for seq or index scans to complete</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 10000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="write_request_timeout_in_ms"><a class="anchor" href="#write_request_timeout_in_ms"></a><a class="link" href="#write_request_timeout_in_ms"><code>write_request_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How long the coordinator should wait for writes to complete</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 2000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="counter_write_request_timeout_in_ms"><a class="anchor" href="#counter_write_request_timeout_in_ms"></a><a class="link" href="#counter_write_request_timeout_in_ms"><code>counter_write_request_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How long the coordinator should wait for counter writes to complete</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 5000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cas_contention_timeout_in_ms"><a class="anchor" href="#cas_contention_timeout_in_ms"></a><a class="link" href="#cas_contention_timeout_in_ms"><code>cas_contention_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How long a coordinator should continue to retry a CAS operation |
| that contends with other proposals for the same row</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="truncate_request_timeout_in_ms"><a class="anchor" href="#truncate_request_timeout_in_ms"></a><a class="link" href="#truncate_request_timeout_in_ms"><code>truncate_request_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How long the coordinator should wait for truncates to complete |
| (This can be much longer, because unless auto_snapshot is disabled |
| we need to flush first so we can snapshot before removing the data.)</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 60000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="request_timeout_in_ms"><a class="anchor" href="#request_timeout_in_ms"></a><a class="link" href="#request_timeout_in_ms"><code>request_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The default timeout for other, miscellaneous operations</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 10000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="slow_query_log_timeout_in_ms"><a class="anchor" href="#slow_query_log_timeout_in_ms"></a><a class="link" href="#slow_query_log_timeout_in_ms"><code>slow_query_log_timeout_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>How long before a node logs slow queries. Select queries that take longer than |
| this timeout to execute, will generate an aggregated log message, so that slow queries |
| can be identified. Set this value to zero to disable slow query logging.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 500</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cross_node_timeout"><a class="anchor" href="#cross_node_timeout"></a><a class="link" href="#cross_node_timeout"><code>cross_node_timeout</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enable operation timeout information exchange between nodes to accurately |
| measure request timeouts. If disabled, replicas will assume that requests |
| were forwarded to them instantly by the coordinator, which means that |
| under overload conditions we will waste that much extra time processing |
| already-timed-out requests.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Warning: before enabling this property make sure to ntp is installed |
| and the times are synchronized between the nodes.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="streaming_keep_alive_period_in_secs"><a class="anchor" href="#streaming_keep_alive_period_in_secs"></a><a class="link" href="#streaming_keep_alive_period_in_secs"><code>streaming_keep_alive_period_in_secs</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Set keep-alive period for streaming |
| This node will send a keep-alive message periodically with this period. |
| If the node does not receive a keep-alive message from the peer for |
| 2 keep-alive cycles the stream session times out and fail |
| Default value is 300s (5 minutes), which means stalled stream |
| times out in 10 minutes by default</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 300</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="phi_convict_threshold"><a class="anchor" href="#phi_convict_threshold"></a><a class="link" href="#phi_convict_threshold"><code>phi_convict_threshold</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>phi value that must be reached for a host to be marked down. |
| most users should never need to adjust this.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 8</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="endpoint_snitch"><a class="anchor" href="#endpoint_snitch"></a><a class="link" href="#endpoint_snitch"><code>endpoint_snitch</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>endpoint_snitch — Set this to a class that implements |
| IEndpointSnitch. The snitch has two functions:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>it teaches Cassandra enough about your network topology to route |
| requests efficiently</p> |
| </li> |
| <li> |
| <p>it allows Cassandra to spread replicas around your cluster to avoid |
| correlated failures. It does this by grouping machines into |
| "datacenters" and "racks." Cassandra will do its best not to have |
| more than one replica on the same "rack" (which may not actually |
| be a physical location)</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>CASSANDRA WILL NOT ALLOW YOU TO SWITCH TO AN INCOMPATIBLE SNITCH |
| ONCE DATA IS INSERTED INTO THE CLUSTER. This would cause data loss. |
| This means that if you start with the default SimpleSnitch, which |
| locates every node on "rack1" in "datacenter1", your only options |
| if you need to add another datacenter are GossipingPropertyFileSnitch |
| (and the older PFS). From there, if you want to migrate to an |
| incompatible snitch like Ec2Snitch you can do it by adding new nodes |
| under Ec2Snitch (which will locate them in a new "datacenter") and |
| decommissioning the old ones.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Out of the box, Cassandra provides:</p> |
| </div> |
| <div class="paragraph"> |
| <p>SimpleSnitch: |
| Treats Strategy order as proximity. This can improve cache |
| locality when disabling read repair. Only appropriate for |
| single-datacenter deployments.</p> |
| </div> |
| <div class="paragraph"> |
| <p>GossipingPropertyFileSnitch |
| This should be your go-to snitch for production use. The rack |
| and datacenter for the local node are defined in |
| cassandra-rackdc.properties and propagated to other nodes via |
| gossip. If cassandra-topology.properties exists, it is used as a |
| fallback, allowing migration from the PropertyFileSnitch.</p> |
| </div> |
| <div class="paragraph"> |
| <p>PropertyFileSnitch: |
| Proximity is determined by rack and data center, which are |
| explicitly configured in cassandra-topology.properties.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ec2Snitch: |
| Appropriate for EC2 deployments in a single Region. Loads Region |
| and Availability Zone information from the EC2 API. The Region is |
| treated as the datacenter, and the Availability Zone as the rack. |
| Only private IPs are used, so this will not work across multiple |
| Regions.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ec2MultiRegionSnitch: |
| Uses public IPs as broadcast_address to allow cross-region |
| connectivity. (Thus, you should set seed addresses to the public |
| IP as well.) You will need to open the storage_port or |
| ssl_storage_port on the public IP firewall. (For intra-Region |
| traffic, Cassandra will switch to the private IP after |
| establishing a connection.)</p> |
| </div> |
| <div class="paragraph"> |
| <p>RackInferringSnitch: |
| Proximity is determined by rack and data center, which are |
| assumed to correspond to the 3rd and 2nd octet of each node’s IP |
| address, respectively. Unless this happens to match your |
| deployment conventions, this is best used as an example of |
| writing a custom Snitch class and is provided in that spirit.</p> |
| </div> |
| <div class="paragraph"> |
| <p>You can use a custom Snitch by setting this to the full class name |
| of the snitch, which will be assumed to be on your classpath.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> SimpleSnitch</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="dynamic_snitch_update_interval_in_ms"><a class="anchor" href="#dynamic_snitch_update_interval_in_ms"></a><a class="link" href="#dynamic_snitch_update_interval_in_ms"><code>dynamic_snitch_update_interval_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>controls how often to perform the more expensive part of host score |
| calculation</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 100</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="dynamic_snitch_reset_interval_in_ms"><a class="anchor" href="#dynamic_snitch_reset_interval_in_ms"></a><a class="link" href="#dynamic_snitch_reset_interval_in_ms"><code>dynamic_snitch_reset_interval_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>controls how often to reset all host scores, allowing a bad host to |
| possibly recover</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 600000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="dynamic_snitch_badness_threshold"><a class="anchor" href="#dynamic_snitch_badness_threshold"></a><a class="link" href="#dynamic_snitch_badness_threshold"><code>dynamic_snitch_badness_threshold</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>if set greater than zero and read_repair_chance is < 1.0, this will allow |
| 'pinning' of replicas to hosts in order to increase cache capacity. |
| The badness threshold will control how much worse the pinned host has to be |
| before the dynamic snitch will prefer other replicas over it. This is |
| expressed as a double which represents a percentage. Thus, a value of |
| 0.2 means Cassandra would continue to prefer the static snitch values |
| until the pinned host was 20% worse than the fastest.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 0.1</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="request_scheduler"><a class="anchor" href="#request_scheduler"></a><a class="link" href="#request_scheduler"><code>request_scheduler</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>request_scheduler — Set this to a class that implements |
| RequestScheduler, which will schedule incoming client requests |
| according to the specific policy. This is useful for multi-tenancy |
| with a single Cassandra cluster. |
| NOTE: This is specifically for requests from the client and does |
| not affect inter node communication. |
| org.apache.cassandra.scheduler.NoScheduler - No scheduling takes place |
| org.apache.cassandra.scheduler.RoundRobinScheduler - Round robin of |
| client requests to a node with a separate queue for each |
| request_scheduler_id. The scheduler is further customized by |
| request_scheduler_options as described below.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> org.apache.cassandra.scheduler.NoScheduler</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="request_scheduler_options"><a class="anchor" href="#request_scheduler_options"></a><a class="link" href="#request_scheduler_options"><code>request_scheduler_options</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Scheduler Options vary based on the type of scheduler</p> |
| </div> |
| <div class="paragraph"> |
| <p>NoScheduler |
| Has no options</p> |
| </div> |
| <div class="paragraph"> |
| <p>RoundRobin |
| throttle_limit |
| The throttle_limit is the number of in-flight |
| requests per client. Requests beyond |
| that limit are queued up until |
| running requests can complete. |
| The value of 80 here is twice the number of |
| concurrent_reads + concurrent_writes. |
| default_weight |
| default_weight is optional and allows for |
| overriding the default which is 1. |
| weights |
| Weights are optional and will default to 1 or the |
| overridden default_weight. The weight translates into how |
| many requests are handled during each turn of the |
| RoundRobin, based on the scheduler id.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="request_scheduler_id"><a class="anchor" href="#request_scheduler_id"></a><a class="link" href="#request_scheduler_id"><code>request_scheduler_id</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong> |
| throttle_limit: 80 |
| default_weight: 5 |
| weights: |
| Keyspace1: 1 |
| Keyspace2: 5</p> |
| </div> |
| <div class="paragraph"> |
| <p>request_scheduler_id — An identifier based on which to perform |
| the request scheduling. Currently the only valid option is keyspace.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> keyspace</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="server_encryption_options"><a class="anchor" href="#server_encryption_options"></a><a class="link" href="#server_encryption_options"><code>server_encryption_options</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enable or disable inter-node encryption |
| JVM defaults for supported SSL socket protocols and cipher suites can |
| be replaced using custom encryption options. This is not recommended |
| unless you have policies in place that dictate certain settings, or |
| need to disable vulnerable ciphers or protocols in case the JVM cannot |
| be updated. |
| FIPS compliant settings can be configured at JVM level and should not |
| involve changing encryption settings here: |
| <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/FIPS.html" class="bare">docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/FIPS.html</a> |
| <strong>NOTE</strong> No custom encryption options are enabled at the moment |
| The available internode options are : all, none, dc, rack</p> |
| </div> |
| <div class="paragraph"> |
| <p>If set to dc cassandra will encrypt the traffic between the DCs |
| If set to rack cassandra will encrypt the traffic between the racks</p> |
| </div> |
| <div class="paragraph"> |
| <p>The passwords used in these options must match the passwords used when generating |
| the keystore and truststore. For instructions on generating these files, see: |
| <a href="http://download.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore" class="bare">download.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore</a></p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> internode_encryption: none |
| keystore: conf/.keystore |
| keystore_password: cassandra |
| truststore: conf/.truststore |
| truststore_password: cassandra |
| # More advanced defaults below: |
| # protocol: TLS |
| # algorithm: SunX509 |
| # store_type: JKS |
| # cipher_suites: [TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA] |
| # require_client_auth: false |
| # require_endpoint_verification: false</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="client_encryption_options"><a class="anchor" href="#client_encryption_options"></a><a class="link" href="#client_encryption_options"><code>client_encryption_options</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>enable or disable client/server encryption.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> enabled: false |
| # If enabled and optional is set to true encrypted and unencrypted connections are handled. |
| optional: false |
| keystore: conf/.keystore |
| keystore_password: cassandra |
| # require_client_auth: false |
| # Set trustore and truststore_password if require_client_auth is true |
| # truststore: conf/.truststore |
| # truststore_password: cassandra |
| # More advanced defaults below: |
| # protocol: TLS |
| # algorithm: SunX509 |
| # store_type: JKS |
| # cipher_suites: [TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA]</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="internode_compression"><a class="anchor" href="#internode_compression"></a><a class="link" href="#internode_compression"><code>internode_compression</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>internode_compression controls whether traffic between nodes is |
| compressed. |
| Can be:</p> |
| </div> |
| <div class="paragraph"> |
| <p>all |
| all traffic is compressed</p> |
| </div> |
| <div class="paragraph"> |
| <p>dc |
| traffic between different datacenters is compressed</p> |
| </div> |
| <div class="paragraph"> |
| <p>none |
| nothing is compressed.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> dc</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="inter_dc_tcp_nodelay"><a class="anchor" href="#inter_dc_tcp_nodelay"></a><a class="link" href="#inter_dc_tcp_nodelay"><code>inter_dc_tcp_nodelay</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enable or disable tcp_nodelay for inter-dc communication. |
| Disabling it will result in larger (but fewer) network packets being sent, |
| reducing overhead from the TCP protocol itself, at the cost of increasing |
| latency if you block for cross-datacenter responses.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="tracetype_query_ttl"><a class="anchor" href="#tracetype_query_ttl"></a><a class="link" href="#tracetype_query_ttl"><code>tracetype_query_ttl</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>TTL for different trace types used during logging of the repair process.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 86400</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="tracetype_repair_ttl"><a class="anchor" href="#tracetype_repair_ttl"></a><a class="link" href="#tracetype_repair_ttl"><code>tracetype_repair_ttl</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 604800</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="gc_log_threshold_in_ms"><a class="anchor" href="#gc_log_threshold_in_ms"></a><a class="link" href="#gc_log_threshold_in_ms"><code>gc_log_threshold_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>By default, Cassandra logs GC Pauses greater than 200 ms at INFO level |
| This threshold can be adjusted to minimize logging if necessary</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 200</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="enable_user_defined_functions"><a class="anchor" href="#enable_user_defined_functions"></a><a class="link" href="#enable_user_defined_functions"><code>enable_user_defined_functions</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If unset, all GC Pauses greater than gc_log_threshold_in_ms will log at |
| INFO level |
| UDFs (user defined functions) are disabled by default. |
| As of Cassandra 3.0 there is a sandbox in place that should prevent execution of evil code.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="enable_scripted_user_defined_functions"><a class="anchor" href="#enable_scripted_user_defined_functions"></a><a class="link" href="#enable_scripted_user_defined_functions"><code>enable_scripted_user_defined_functions</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enables scripted UDFs (JavaScript UDFs). |
| Java UDFs are always enabled, if enable_user_defined_functions is true. |
| Enable this option to be able to use UDFs with "language javascript" or any custom JSR-223 provider. |
| This option has no effect, if enable_user_defined_functions is false.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="windows_timer_interval"><a class="anchor" href="#windows_timer_interval"></a><a class="link" href="#windows_timer_interval"><code>windows_timer_interval</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The default Windows kernel timer and scheduling resolution is 15.6ms for power conservation. |
| Lowering this value on Windows can provide much tighter latency and better throughput, however |
| some virtualized environments may see a negative performance impact from changing this setting |
| below their system default. The sysinternals 'clockres' tool can confirm your system’s default |
| setting.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="transparent_data_encryption_options"><a class="anchor" href="#transparent_data_encryption_options"></a><a class="link" href="#transparent_data_encryption_options"><code>transparent_data_encryption_options</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enables encrypting data at-rest (on disk). Different key providers can be plugged in, but the default reads from |
| a JCE-style keystore. A single keystore can hold multiple keys, but the one referenced by |
| the "key_alias" is the only key that will be used for encrypt opertaions; previously used keys |
| can still (and should!) be in the keystore and will be used on decrypt operations |
| (to handle the case of key rotation).</p> |
| </div> |
| <div class="paragraph"> |
| <p>It is strongly recommended to download and install Java Cryptography Extension (JCE) |
| Unlimited Strength Jurisdiction Policy Files for your version of the JDK. |
| (current link: <a href="http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html" class="bare">www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html</a>)</p> |
| </div> |
| <div class="paragraph"> |
| <p>Currently, only the following file types are supported for transparent data encryption, although |
| more are coming in future cassandra releases: commitlog, hints</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value (complex option)</em>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre> enabled: false |
| chunk_length_kb: 64 |
| cipher: AES/CBC/PKCS5Padding |
| key_alias: testing:1 |
| # CBC IV length for AES needs to be 16 bytes (which is also the default size) |
| # iv_length: 16 |
| key_provider: |
| - class_name: org.apache.cassandra.security.JKSKeyProvider |
| parameters: |
| - keystore: conf/.keystore |
| keystore_password: cassandra |
| store_type: JCEKS |
| key_password: cassandra</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="tombstone_warn_threshold"><a class="anchor" href="#tombstone_warn_threshold"></a><a class="link" href="#tombstone_warn_threshold"><code>tombstone_warn_threshold</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><mark><mark></mark><mark></mark></mark><mark><mark></mark><mark></mark></mark> |
| SAFETY THRESHOLDS # |
| <mark><mark></mark><mark></mark></mark><mark><mark></mark><mark></mark></mark></p> |
| </div> |
| <div class="paragraph"> |
| <p>When executing a scan, within or across a partition, we need to keep the |
| tombstones seen in memory so we can return them to the coordinator, which |
| will use them to make sure other replicas also know about the deleted rows. |
| With workloads that generate a lot of tombstones, this can cause performance |
| problems and even exaust the server heap. |
| (<a href="http://www.datastax.com/dev/blog/cassandra-anti-patterns-queues-and-queue-like-datasets" class="bare">www.datastax.com/dev/blog/cassandra-anti-patterns-queues-and-queue-like-datasets</a>) |
| Adjust the thresholds here if you understand the dangers and want to |
| scan more tombstones anyway. These thresholds may also be adjusted at runtime |
| using the StorageService mbean.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="tombstone_failure_threshold"><a class="anchor" href="#tombstone_failure_threshold"></a><a class="link" href="#tombstone_failure_threshold"><code>tombstone_failure_threshold</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 100000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="replica_filtering_protection"><a class="anchor" href="#replica_filtering_protection"></a><a class="link" href="#replica_filtering_protection"><code>replica_filtering_protection</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Filtering and secondary index queries at read consistency levels above ONE/LOCAL_ONE use a |
| mechanism called replica filtering protection to ensure that results from stale replicas do |
| not violate consistency. (See CASSANDRA-8272 and CASSANDRA-15907 for more details.) This |
| mechanism materializes replica results by partition on-heap at the coordinator. The more possibly |
| stale results returned by the replicas, the more rows materialized during the query.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="batch_size_warn_threshold_in_kb"><a class="anchor" href="#batch_size_warn_threshold_in_kb"></a><a class="link" href="#batch_size_warn_threshold_in_kb"><code>batch_size_warn_threshold_in_kb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Log WARN on any multiple-partition batch size exceeding this value. 5kb per batch by default. |
| Caution should be taken on increasing the size of this threshold as it can lead to node instability.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 5</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="batch_size_fail_threshold_in_kb"><a class="anchor" href="#batch_size_fail_threshold_in_kb"></a><a class="link" href="#batch_size_fail_threshold_in_kb"><code>batch_size_fail_threshold_in_kb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Fail any multiple-partition batch exceeding this value. 50kb (10x warn threshold) by default.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 50</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="unlogged_batch_across_partitions_warn_threshold"><a class="anchor" href="#unlogged_batch_across_partitions_warn_threshold"></a><a class="link" href="#unlogged_batch_across_partitions_warn_threshold"><code>unlogged_batch_across_partitions_warn_threshold</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Log WARN on any batches not of type LOGGED than span across more partitions than this limit</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 10</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="compaction_large_partition_warning_threshold_mb"><a class="anchor" href="#compaction_large_partition_warning_threshold_mb"></a><a class="link" href="#compaction_large_partition_warning_threshold_mb"><code>compaction_large_partition_warning_threshold_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Log a warning when compacting partitions larger than this value</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 100</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="gc_warn_threshold_in_ms"><a class="anchor" href="#gc_warn_threshold_in_ms"></a><a class="link" href="#gc_warn_threshold_in_ms"><code>gc_warn_threshold_in_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>GC Pauses greater than gc_warn_threshold_in_ms will be logged at WARN level |
| Adjust the threshold based on your application throughput requirement |
| By default, Cassandra logs GC Pauses greater than 200 ms at INFO level</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 1000</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="max_value_size_in_mb"><a class="anchor" href="#max_value_size_in_mb"></a><a class="link" href="#max_value_size_in_mb"><code>max_value_size_in_mb</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Maximum size of any value in SSTables. Safety measure to detect SSTable corruption |
| early. Any value size larger than this threshold will result into marking an SSTable |
| as corrupted. This should be positive and less than 2048.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 256</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="back_pressure_enabled"><a class="anchor" href="#back_pressure_enabled"></a><a class="link" href="#back_pressure_enabled"><code>back_pressure_enabled</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Back-pressure settings # |
| If enabled, the coordinator will apply the back-pressure strategy specified below to each mutation |
| sent to replicas, with the aim of reducing pressure on overloaded replicas.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="back_pressure_strategy"><a class="anchor" href="#back_pressure_strategy"></a><a class="link" href="#back_pressure_strategy"><code>back_pressure_strategy</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The back-pressure strategy applied. |
| The default implementation, RateBasedBackPressure, takes three arguments: |
| high ratio, factor, and flow type, and uses the ratio between incoming mutation responses and outgoing mutation requests. |
| If below high ratio, outgoing mutations are rate limited according to the incoming rate decreased by the given factor; |
| if above high ratio, the rate limiting is increased by the given factor; |
| such factor is usually best configured between 1 and 10, use larger values for a faster recovery |
| at the expense of potentially more dropped mutations; |
| the rate limiting is applied according to the flow type: if FAST, it’s rate limited at the speed of the fastest replica, |
| if SLOW at the speed of the slowest one. |
| New strategies can be added. Implementors need to implement org.apache.cassandra.net.BackpressureStrategy and |
| provide a public constructor accepting a Map<String, Object>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="otc_coalescing_strategy"><a class="anchor" href="#otc_coalescing_strategy"></a><a class="link" href="#otc_coalescing_strategy"><code>otc_coalescing_strategy</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Coalescing Strategies # |
| Coalescing multiples messages turns out to significantly boost message processing throughput (think doubling or more). |
| On bare metal, the floor for packet processing throughput is high enough that many applications won’t notice, but in |
| virtualized environments, the point at which an application can be bound by network packet processing can be |
| surprisingly low compared to the throughput of task processing that is possible inside a VM. It’s not that bare metal |
| doesn’t benefit from coalescing messages, it’s that the number of packets a bare metal network interface can process |
| is sufficient for many applications such that no load starvation is experienced even without coalescing. |
| There are other benefits to coalescing network messages that are harder to isolate with a simple metric like messages |
| per second. By coalescing multiple tasks together, a network thread can process multiple messages for the cost of one |
| trip to read from a socket, and all the task submission work can be done at the same time reducing context switching |
| and increasing cache friendliness of network message processing. |
| See CASSANDRA-8692 for details.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Strategy to use for coalescing messages in OutboundTcpConnection. |
| Can be fixed, movingaverage, timehorizon, disabled (default). |
| You can also specify a subclass of CoalescingStrategies.CoalescingStrategy by name.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> DISABLED</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="otc_coalescing_window_us"><a class="anchor" href="#otc_coalescing_window_us"></a><a class="link" href="#otc_coalescing_window_us"><code>otc_coalescing_window_us</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>How many microseconds to wait for coalescing. For fixed strategy this is the amount of time after the first |
| message is received before it will be sent with any accompanying messages. For moving average this is the |
| maximum amount of time that will be waited as well as the interval at which messages must arrive on average |
| for coalescing to be enabled.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 200</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="otc_coalescing_enough_coalesced_messages"><a class="anchor" href="#otc_coalescing_enough_coalesced_messages"></a><a class="link" href="#otc_coalescing_enough_coalesced_messages"><code>otc_coalescing_enough_coalesced_messages</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Do not try to coalesce messages if we already got that many messages. This should be more than 2 and less than 128.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 8</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="otc_backlog_expiration_interval_ms"><a class="anchor" href="#otc_backlog_expiration_interval_ms"></a><a class="link" href="#otc_backlog_expiration_interval_ms"><code>otc_backlog_expiration_interval_ms</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>This option is commented out by default.</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>How many milliseconds to wait between two expiration runs on the backlog (queue) of the OutboundTcpConnection. |
| Expiration is done if messages are piling up in the backlog. Droppable messages are expired to free the memory |
| taken by expired messages. The interval should be between 0 and 1000, and in most installations the default value |
| will be appropriate. A smaller value could potentially expire messages slightly sooner at the expense of more CPU |
| time and queue contention while iterating the backlog of messages. |
| An interval of 0 disables any wait time, which is the behavior of former Cassandra versions.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> 200</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="enable_materialized_views"><a class="anchor" href="#enable_materialized_views"></a><a class="link" href="#enable_materialized_views"><code>enable_materialized_views</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><mark><mark></mark><mark></mark></mark><mark><mark></mark><mark></mark></mark><mark><mark># |
| EXPERIMENTAL FEATURES # |
| </mark><mark></mark></mark><mark><mark></mark><mark></mark></mark><mark><mark></mark></mark>#</p> |
| </div> |
| <div class="paragraph"> |
| <p>Enables materialized view creation on this node. |
| Materialized views are considered experimental and are not recommended for production use.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> true</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="enable_sasi_indexes"><a class="anchor" href="#enable_sasi_indexes"></a><a class="link" href="#enable_sasi_indexes"><code>enable_sasi_indexes</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enables SASI index creation on this node. |
| SASI indexes are considered experimental and are not recommended for production use.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> true</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="enable_drop_compact_storage"><a class="anchor" href="#enable_drop_compact_storage"></a><a class="link" href="#enable_drop_compact_storage"><code>enable_drop_compact_storage</code></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Enables the used of 'ALTER …​ DROP COMPACT STORAGE' statements on this node. |
| 'ALTER …​ DROP COMPACT STORAGE' is considered experimental and is not recommended for production use.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Default Value:</em> false</p> |
| </div> |
| </div> |
| </div> |
| </article> |
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