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| <li class="crumb">Cassandra</li> |
| <li class="crumb"><a href="index.html">Configuration</a></li> |
| <li class="crumb"><a href="configuration.html">Liberating cassandra.yaml Parameters' Names from Their Units</a></li> |
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| <article class="doc"> |
| <h1 class="page">Liberating cassandra.yaml Parameters' Names from Their Units</h1> |
| <div class="sect1"> |
| <h2 id="objective"><a class="anchor" href="#objective"></a>Objective</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Three big things happened as part of <a href="https://issues.apache.org/jira/browse/CASSANDRA-15234">CASSANDRA-15234</a>:</p> |
| </div> |
| <div class="paragraph"> |
| <p>1) Renaming of parameters in <code>cassandra.yaml</code> to follow the form <code>noun_verb</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>2) Liberating <code>cassandra.yaml</code> parameters from their units (DataStorage, DataRate and Duration) and introducing temporary smallest accepted unit per parameter (only for DataStorage and Duration ones)</p> |
| </div> |
| <div class="paragraph"> |
| <p>3) Backward compatibility framework to support the old names and lack of units support until at least the next major release.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="renamed-parameters"><a class="anchor" href="#renamed-parameters"></a>Renamed Parameters</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The community has decided to allow operators to specify units for Cassandra parameters of types duration, data storage, and data rate. |
| All parameters which had a particular unit (most of the time added as a suffix to their name) can be now set by using the format [value][unit]. The unit suffix has been removed from their names. |
| Supported units:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Parameter Type</th> |
| <th class="tableblock halign-left valign-top">Units Supported</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Duration</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">d, h, m, s, ms, us, µs, ns</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Data Storage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B, KiB, MiB, GiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Data Rate</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B/s, MiB/s, KiB/s</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p><strong>Example</strong>:</p> |
| </div> |
| <div class="paragraph"> |
| <p>Old name and value format:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>permissions_update_interval_ms: 0</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>New name and possible value formats:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>permissions_update_interval: 0ms |
| permissions_update_interval: 0s |
| permissions_update_interval: 0d |
| permissions_update_interval: 0us |
| permissions_update_interval: 0µs</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The work in <a href="https://issues.apache.org/jira/browse/CASSANDRA-15234">CASSANDRA-15234</a> was already quite big, so we decided |
| to introduce the notion of the smallest allowed unit per parameter for duration and data storage parameters. What does this mean? |
| Cassandra’s internals still use the old units for parameters. If, for example, seconds are used internally, but you want |
| to add a value in nanoseconds in <code>cassandra.yaml</code>, you will get a configuration exception that contains the following information:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Accepted units: seconds, minutes, hours, days.</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Why was this needed? |
| Because we can run into precision issues. The full solution to the problem is to convert internally all parameters’ values |
| to be manipulated with the smallest supported by Cassandra unit. A series of tickets to assess and maybe migrate to the smallest unit |
| our parameters (incrementally, post <a href="https://issues.apache.org/jira/browse/CASSANDRA-15234">CASSANDRA-15234</a>) will be opened in the future.</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Old Name</th> |
| <th class="tableblock halign-left valign-top">New Name</th> |
| <th class="tableblock halign-left valign-top">The Smallest Supported Unit</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">permissions_validity_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">permissions_validity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">permissions_update_interval_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">permissions_update_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">roles_validity_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">roles_validity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">roles_update_interval_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">roles_update_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">credentials_validity_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">credentials_validity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">credentials_update_interval_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">credentials_update_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_hint_window_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_hint_window</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">native_transport_idle_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">native_transport_idle_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">read_request_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">read_request_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">range_request_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">range_request_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">write_request_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">write_request_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">counter_write_request_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">counter_write_request_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cas_contention_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cas_contention_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">truncate_request_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">truncate_request_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">streaming_keep_alive_period_in_secs</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">streaming_keep_alive_period</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">s</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cross_node_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">slow_query_log_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">slow_query_log_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">memtable_heap_space_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">memtable_heap_space</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">memtable_offheap_space_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">memtable_offheap_space</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">repair_session_space_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">repair_session_space</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_max_message_size_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_max_message_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_send_buff_size_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_socket_send_buffer_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_socket_send_buffer_size_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_socket_send_buffer_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_socket_receive_buffer_size_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_socket_receive_buffer_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_recv_buff_size_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_socket_receive_buffer_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_send_queue_capacity_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_send_queue_capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_send_queue_reserve_endpoint_capacity_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_send_queue_reserve_endpoint_capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_send_queue_reserve_global_capacity_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_send_queue_reserve_global_capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_receive_queue_capacity_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_receive_queue_capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_receive_queue_reserve_endpoint_capacity_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_receive_queue_reserve_endpoint_capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_receive_queue_reserve_global_capacity_in_bytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_application_receive_queue_reserve_global_capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">B</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_tcp_connect_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_tcp_connect_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_tcp_user_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_tcp_user_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_streaming_tcp_user_timeout_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internode_streaming_tcp_user_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">native_transport_max_frame_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">native_transport_max_frame_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_value_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_value_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">column_index_size_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">column_index_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">column_index_cache_size_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">column_index_cache_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">batch_size_warn_threshold_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">batch_size_warn_threshold</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">batch_size_fail_threshold_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">batch_size_fail_threshold</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">compaction_throughput_mb_per_sec</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">compaction_throughput</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB/s</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">compaction_large_partition_warning_threshold_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">compaction_large_partition_warning_threshold</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">min_free_space_per_drive_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">min_free_space_per_drive</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">stream_throughput_outbound_megabits_per_sec</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">stream_throughput_outbound</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB/s</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">inter_dc_stream_throughput_outbound_megabits_per_sec</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">inter_dc_stream_throughput_outbound</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB/s</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_total_space_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_total_space</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_sync_group_window_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_sync_group_window</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_sync_period_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_sync_period</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_segment_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">commitlog_segment_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">periodic_commitlog_sync_lag_block_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">periodic_commitlog_sync_lag_block</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_mutation_size_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_mutation_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cdc_total_space_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cdc_total_space</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cdc_free_space_check_interval_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cdc_free_space_check_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">dynamic_snitch_update_interval_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">dynamic_snitch_update_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">dynamic_snitch_reset_interval_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">dynamic_snitch_reset_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">hinted_handoff_throttle_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">hinted_handoff_throttle</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">batchlog_replay_throttle_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">batchlog_replay_throttle</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">hints_flush_period_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">hints_flush_period</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_hints_file_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">max_hints_file_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">trickle_fsync_interval_in_kb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">trickle_fsync_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">sstable_preemptive_open_interval_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">sstable_preemptive_open_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">key_cache_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">key_cache_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">row_cache_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">row_cache_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">counter_cache_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">counter_cache_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">networking_cache_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">networking_cache_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">file_cache_size_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">file_cache_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">index_summary_capacity_in_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">index_summary_capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">index_summary_resize_interval_in_minutes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">index_summary_resize_interval</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">m</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">gc_log_threshold_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">gc_log_threshold</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">gc_warn_threshold_in_ms</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">gc_warn_threshold</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">tracetype_query_ttl</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">trace_type_query_ttl</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">s</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">tracetype_repair_ttl</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">trace_type_repair_ttl</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">s</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">prepared_statements_cache_size_mb</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">prepared_statements_cache_size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiB</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_user_defined_functions</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">user_defined_functions_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_scripted_user_defined_functions</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">scripted_user_defined_functions_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_materialized_views</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">materialized_views_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_transient_replication</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">transient_replication_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_sasi_indexes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">sasi_indexes_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_drop_compact_storage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">drop_compact_storage_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_user_defined_functions_threads</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">user_defined_functions_threads_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">enable_legacy_ssl_storage_port</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">legacy_ssl_storage_port_enabled</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">user_defined_function_fail_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">user_defined_functions_fail_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">user_defined_function_warn_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">user_defined_functions_warn_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ms</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cache_load_timeout_seconds</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">cache_load_timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">s</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>Another TO DO is to add JMX methods supporting the new format. However, we may abandon this if virtual tables support |
| configuration changes in the near future.</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>Notes for Cassandra Developers</strong>:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Most of our parameters are already moved to the new framework as part of <a href="https://issues.apache.org/jira/browse/CASSANDRA-15234">CASSANDRA-15234</a>. |
| <code>@Replaces</code> is the annotation to be used when you make changes to any configuration parameters in <code>Config</code> class and <code>cassandra.yaml</code>, and you want to add backward |
| compatibility with previous Cassandra versions. <code>Converters</code> class enumerates the different methods used for backward compatibility. |
| <code>IDENTITY</code> is the one used for name change only. For more information about the other Converters, please, check the JavaDoc in the class. |
| For backward compatibility virtual table <code>Settings</code> contains both the old and the new |
| parameters with the old and the new value format. Only exception at the moment are the following three parameters: <code>key_cache_save_period</code>, |
| <code>row_cache_save_period</code> and <code>counter_cache_save_period</code> which appear only once with the new value format. |
| The old names and value format still can be used at least until the next major release. Deprecation warning is emitted on startup. |
| If the parameter is of type duration, data rate or data storage, its value should be accompanied by a unit when new name is used.</p> |
| </li> |
| <li> |
| <p>Please follow the new format <code>noun_verb</code> when adding new configuration parameters.</p> |
| </li> |
| <li> |
| <p>Please consider adding any new parameters with the lowest supported by Cassandra unit when possible. Our new types also |
| support long and integer upper bound, depending on your needs. All options for configuration parameters' types are nested |
| classes in our three main abstract classes - <code>DurationSpec</code>, <code>DataStorageSpec</code>, <code>DataRateSpec</code>.</p> |
| </li> |
| <li> |
| <p>If for some reason you consider the smallest unit for a new parameter shouldn’t be the one that is supported as such in |
| Cassandra, you can use the rest of the nested classes in <code>DurationSpec</code>, <code>DataStorageSpec</code>. The smallest allowed unit is |
| the one we use internally for the property, so we don’t have to do conversions to bigger units which will lead to precision |
| problems. This is a problem only with <code>DurationSpec</code> and <code>DataStorageSpec</code>. <code>DataRateSpec</code> is handled internally in double.</p> |
| </li> |
| <li> |
| <p>New parameters should be added as non-negative numbers. For parameters where you would have set -1 to disable in the past, you might |
| want to consider a separate flag parameter or null value. In case you use the null value, please, ensure that any default value |
| introduced in the DatabaseDescriptor to handle it is also duplicated in any related setters.</p> |
| </li> |
| <li> |
| <p>Parameters of type data storage, duration and data rate cannot be set to Long.MAX_VALUE (former parameters of long type) |
| and Integer.MAX_VALUE (former parameters of int type). That numbers are used during conversion between units to prevent |
| an overflow from happening.</p> |
| </li> |
| <li> |
| <p>Any time you add @Replaces with a name change, we need to add an entry in this <a href="https://github.com/riptano/ccm/blob/808b6ca13526785b0fddfe1ead2383c060c4b8b6/ccmlib/common.py#L62">Python dictionary in CCM</a> to support the same backward compatibility as SnakeYAML.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Please follow the instructions in requirements.txt in the DTest repo how to retag CCM after committing any changes. |
| You might want to test also with tagging in your repo to ensure that there will be no surprise after retagging the official CCM. |
| Please be sure to run a full CI after any changes as CCM affects a few of our testing suites.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Some configuration parameters are not announced in cassandra.yaml, but they are presented in the Config class for advanced users. |
| Those also should be using the new framework and naming conventions.</p> |
| </li> |
| <li> |
| <p>As we have backward compatibility, we didn’t have to rework all python DTests to set config in the new format, and we exercise |
| the backward compatibility while testing. Please consider adding any new tests using the new names and value format though.</p> |
| </li> |
| <li> |
| <p>In-JVM upgrade tests do not support per-version configuration at the moment, so we have to keep the old names and value format. |
| Currently, if we try to use the new config for a newer version, that will be silently ignored and default config will be used.</p> |
| </li> |
| <li> |
| <p>SnakeYAML supports overloading of parameters. This means that if you add a configuration parameter more than once in your <code>cassandra.yaml</code> - |
| the latest occasion will be the one to load in Config during Cassandra startup. In order to make upgrades as less disruptive as possible, |
| we continue supporting that behavior also with adding old and new names of a parameter into <code>cassandra.yaml</code>.</p> |
| </li> |
| <li> |
| <p>Please ensure that any JMX setters/getters update the Config class properties and not some local copies. Settings Virtual Table |
| reports the configuration loaded at any time from the Config class.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p><strong>Example</strong>:</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you add the following to <code>cassandra.yaml</code>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>hinted_handoff_enabled: true |
| enabled_hinted_handolff: false</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>you will get loaded in <code>Config</code>:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>hinted_handoff_enabled: false</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><a href="https://issues.apache.org/jira/browse/CASSANDRA-17379">CASSANDRA-17379</a> was opened to improve the user experience and deprecate the overloading. |
| By default, we refuse starting Cassandra with a config containing both old and new config keys for the same parameter. Start |
| Cassandra with <code>-Dcassandra.allow_new_old_config_keys=true</code> to override. For historical reasons duplicate config keys |
| in <code>cassandra.yaml</code> are allowed by default, start Cassandra with <code>-Dcassandra.allow_duplicate_config_keys=false</code> to disallow this. |
| Please note that <code>key_cache_save_period</code>, <code>row_cache_save_period</code>, <code>counter_cache_save_period</code> will be affected only by <code>-Dcassandra.allow_duplicate_config_keys</code>.</p> |
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