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<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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<configuration>
<property>
<name>hbase.rootdir</name>
<value>file:///tmp/hbase-${user.name}/hbase</value>
<description>The directory shared by region servers and into
which HBase persists. The URL should be 'fully-qualified'
to include the filesystem scheme. For example, to specify the
HDFS directory '/hbase' where the HDFS instance's namenode is
running at namenode.example.org on port 9000, set this value to:
hdfs://namenode.example.org:9000/hbase. By default HBase writes
into /tmp. Change this configuration else all data will be lost
on machine restart.
</description>
</property>
<property>
<name>hbase.master.port</name>
<value>60000</value>
<description>The port the HBase Master should bind to.</description>
</property>
<property>
<name>hbase.cluster.distributed</name>
<value>false</value>
<description>The mode the cluster will be in. Possible values are
false for standalone mode and true for distributed mode. If
false, startup will run all HBase and ZooKeeper daemons together
in the one JVM.
</description>
</property>
<property>
<name>hbase.tmp.dir</name>
<value>/tmp/hbase-${user.name}</value>
<description>Temporary directory on the local filesystem.
Change this setting to point to a location more permanent
than '/tmp' (The '/tmp' directory is often cleared on
machine restart).
</description>
</property>
<property>
<name>hbase.master.info.port</name>
<value>60010</value>
<description>The port for the HBase Master web UI.
Set to -1 if you do not want a UI instance run.
</description>
</property>
<property>
<name>hbase.master.info.bindAddress</name>
<value>0.0.0.0</value>
<description>The bind address for the HBase Master web UI
</description>
</property>
<property>
<name>hbase.client.write.buffer</name>
<value>2097152</value>
<description>Default size of the HTable clien write buffer in bytes.
A bigger buffer takes more memory -- on both the client and server
side since server instantiates the passed write buffer to process
it -- but a larger buffer size reduces the number of RPCs made.
For an estimate of server-side memory-used, evaluate
hbase.client.write.buffer * hbase.regionserver.handler.count
</description>
</property>
<property>
<name>hbase.regionserver.port</name>
<value>60020</value>
<description>The port the HBase RegionServer binds to.
</description>
</property>
<property>
<name>hbase.regionserver.info.port</name>
<value>60030</value>
<description>The port for the HBase RegionServer web UI
Set to -1 if you do not want the RegionServer UI to run.
</description>
</property>
<property>
<name>hbase.regionserver.info.port.auto</name>
<value>false</value>
<description>Whether or not the Master or RegionServer
UI should search for a port to bind to. Enables automatic port
search if hbase.regionserver.info.port is already in use.
Useful for testing, turned off by default.
</description>
</property>
<property>
<name>hbase.regionserver.info.bindAddress</name>
<value>0.0.0.0</value>
<description>The address for the HBase RegionServer web UI
</description>
</property>
<property>
<name>hbase.regionserver.class</name>
<value>org.apache.hadoop.hbase.ipc.HRegionInterface</value>
<description>The RegionServer interface to use.
Used by the client opening proxy to remote region server.
</description>
</property>
<property>
<name>hbase.client.pause</name>
<value>1000</value>
<description>General client pause value. Used mostly as value to wait
before running a retry of a failed get, region lookup, etc.</description>
</property>
<property>
<name>hbase.client.retries.number</name>
<value>10</value>
<description>Maximum retries. Used as maximum for all retryable
operations such as fetching of the root region from root region
server, getting a cell's value, starting a row update, etc.
Default: 10.
</description>
</property>
<property>
<name>hbase.bulkload.retries.number</name>
<value>0</value>
<description>Maximum retries. This is maximum number of iterations
to atomic bulk loads are attempted in the face of splitting operations
0 means never give up. Default: 0.
</description>
</property>
<property>
<name>hbase.client.scanner.caching</name>
<value>1</value>
<description>Number of rows that will be fetched when calling next
on a scanner if it is not served from (local, client) memory. Higher
caching values will enable faster scanners but will eat up more memory
and some calls of next may take longer and longer times when the cache is empty.
Do not set this value such that the time between invocations is greater
than the scanner timeout; i.e. hbase.regionserver.lease.period
</description>
</property>
<property>
<name>hbase.client.keyvalue.maxsize</name>
<value>10485760</value>
<description>Specifies the combined maximum allowed size of a KeyValue
instance. This is to set an upper boundary for a single entry saved in a
storage file. Since they cannot be split it helps avoiding that a region
cannot be split any further because the data is too large. It seems wise
to set this to a fraction of the maximum region size. Setting it to zero
or less disables the check.
</description>
</property>
<property>
<name>hbase.regionserver.lease.period</name>
<value>60000</value>
<description>HRegion server lease period in milliseconds. Default is
60 seconds. Clients must report in within this period else they are
considered dead.</description>
</property>
<property>
<name>hbase.regionserver.handler.count</name>
<value>10</value>
<description>Count of RPC Listener instances spun up on RegionServers.
Same property is used by the Master for count of master handlers.
Default is 10.
</description>
</property>
<property>
<name>hbase.regionserver.msginterval</name>
<value>3000</value>
<description>Interval between messages from the RegionServer to Master
in milliseconds.
</description>
</property>
<property>
<name>hbase.regionserver.optionallogflushinterval</name>
<value>1000</value>
<description>Sync the HLog to the HDFS after this interval if it has not
accumulated enough entries to trigger a sync. Default 1 second. Units:
milliseconds.
</description>
</property>
<property>
<name>hbase.regionserver.regionSplitLimit</name>
<value>2147483647</value>
<description>Limit for the number of regions after which no more region
splitting should take place. This is not a hard limit for the number of
regions but acts as a guideline for the regionserver to stop splitting after
a certain limit. Default is set to MAX_INT; i.e. do not block splitting.
</description>
</property>
<property>
<name>hbase.regionserver.logroll.period</name>
<value>3600000</value>
<description>Period at which we will roll the commit log regardless
of how many edits it has.</description>
</property>
<property>
<name>hbase.regionserver.logroll.errors.tolerated</name>
<value>2</value>
<description>The number of consecutive WAL close errors we will allow
before triggering a server abort. A setting of 0 will cause the
region server to abort if closing the current WAL writer fails during
log rolling. Even a small value (2 or 3) will allow a region server
to ride over transient HDFS errors.</description>
</property>
<property>
<name>hbase.regionserver.hlog.reader.impl</name>
<value>org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader</value>
<description>The HLog file reader implementation.</description>
</property>
<property>
<name>hbase.regionserver.hlog.writer.impl</name>
<value>org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter</value>
<description>The HLog file writer implementation.</description>
</property>
<property>
<name>hbase.regionserver.nbreservationblocks</name>
<value>4</value>
<description>The number of resevoir blocks of memory release on
OOME so we can cleanup properly before server shutdown.
</description>
</property>
<property>
<name>hbase.zookeeper.dns.interface</name>
<value>default</value>
<description>The name of the Network Interface from which a ZooKeeper server
should report its IP address.
</description>
</property>
<property>
<name>hbase.zookeeper.dns.nameserver</name>
<value>default</value>
<description>The host name or IP address of the name server (DNS)
which a ZooKeeper server should use to determine the host name used by the
master for communication and display purposes.
</description>
</property>
<property>
<name>hbase.regionserver.dns.interface</name>
<value>default</value>
<description>The name of the Network Interface from which a region server
should report its IP address.
</description>
</property>
<property>
<name>hbase.regionserver.dns.nameserver</name>
<value>default</value>
<description>The host name or IP address of the name server (DNS)
which a region server should use to determine the host name used by the
master for communication and display purposes.
</description>
</property>
<property>
<name>hbase.master.dns.interface</name>
<value>default</value>
<description>The name of the Network Interface from which a master
should report its IP address.
</description>
</property>
<property>
<name>hbase.master.dns.nameserver</name>
<value>default</value>
<description>The host name or IP address of the name server (DNS)
which a master should use to determine the host name used
for communication and display purposes.
</description>
</property>
<property>
<name>hbase.balancer.period
</name>
<value>300000</value>
<description>Period at which the region balancer runs in the Master.
</description>
</property>
<property>
<name>hbase.regions.slop</name>
<value>0.2</value>
<description>Rebalance if any regionserver has average + (average * slop) regions.
Default is 20% slop.
</description>
</property>
<property>
<name>hbase.master.logcleaner.ttl</name>
<value>600000</value>
<description>Maximum time a HLog can stay in the .oldlogdir directory,
after which it will be cleaned by a Master thread.
</description>
</property>
<property>
<name>hbase.master.logcleaner.plugins</name>
<value>org.apache.hadoop.hbase.master.cleaner.TimeToLiveLogCleaner</value>
<description>A comma-separated list of LogCleanerDelegate invoked by
the LogsCleaner service. These WAL/HLog cleaners are called in order,
so put the HLog cleaner that prunes the most HLog files in front. To
implement your own LogCleanerDelegate, just put it in HBase's classpath
and add the fully qualified class name here. Always add the above
default log cleaners in the list.
</description>
</property>
<property>
<name>hbase.regionserver.global.memstore.upperLimit</name>
<value>0.4</value>
<description>Maximum size of all memstores in a region server before new
updates are blocked and flushes are forced. Defaults to 40% of heap
</description>
</property>
<property>
<name>hbase.regionserver.global.memstore.lowerLimit</name>
<value>0.35</value>
<description>When memstores are being forced to flush to make room in
memory, keep flushing until we hit this mark. Defaults to 35% of heap.
This value equal to hbase.regionserver.global.memstore.upperLimit causes
the minimum possible flushing to occur when updates are blocked due to
memstore limiting.
</description>
</property>
<property>
<name>hbase.server.thread.wakefrequency</name>
<value>10000</value>
<description>Time to sleep in between searches for work (in milliseconds).
Used as sleep interval by service threads such as log roller.
</description>
</property>
<property>
<name>hbase.server.versionfile.writeattempts</name>
<value>3</value>
<description>
How many time to retry attempting to write a version file
before just aborting. Each attempt is seperated by the
hbase.server.thread.wakefrequency milliseconds.
</description>
</property>
<property>
<name>hbase.hregion.memstore.flush.size</name>
<value>134217728</value>
<description>
Memstore will be flushed to disk if size of the memstore
exceeds this number of bytes. Value is checked by a thread that runs
every hbase.server.thread.wakefrequency.
</description>
</property>
<property>
<name>hbase.hregion.preclose.flush.size</name>
<value>5242880</value>
<description>
If the memstores in a region are this size or larger when we go
to close, run a "pre-flush" to clear out memstores before we put up
the region closed flag and take the region offline. On close,
a flush is run under the close flag to empty memory. During
this time the region is offline and we are not taking on any writes.
If the memstore content is large, this flush could take a long time to
complete. The preflush is meant to clean out the bulk of the memstore
before putting up the close flag and taking the region offline so the
flush that runs under the close flag has little to do.
</description>
</property>
<property>
<name>hbase.hregion.memstore.block.multiplier</name>
<value>2</value>
<description>
Block updates if memstore has hbase.hregion.block.memstore
time hbase.hregion.flush.size bytes. Useful preventing
runaway memstore during spikes in update traffic. Without an
upper-bound, memstore fills such that when it flushes the
resultant flush files take a long time to compact or split, or
worse, we OOME.
</description>
</property>
<property>
<name>hbase.hregion.memstore.mslab.enabled</name>
<value>true</value>
<description>
Enables the MemStore-Local Allocation Buffer,
a feature which works to prevent heap fragmentation under
heavy write loads. This can reduce the frequency of stop-the-world
GC pauses on large heaps.
</description>
</property>
<property>
<name>hbase.hregion.max.filesize</name>
<value>10737418240</value>
<description>
Maximum HStoreFile size. If any one of a column families' HStoreFiles has
grown to exceed this value, the hosting HRegion is split in two.
Default: 10G.
</description>
</property>
<property>
<name>hbase.hstore.compactionThreshold</name>
<value>3</value>
<description>
If more than this number of HStoreFiles in any one HStore
(one HStoreFile is written per flush of memstore) then a compaction
is run to rewrite all HStoreFiles files as one. Larger numbers
put off compaction but when it runs, it takes longer to complete.
</description>
</property>
<property>
<name>hbase.hstore.blockingStoreFiles</name>
<value>7</value>
<description>
If more than this number of StoreFiles in any one Store
(one StoreFile is written per flush of MemStore) then updates are
blocked for this HRegion until a compaction is completed, or
until hbase.hstore.blockingWaitTime has been exceeded.
</description>
</property>
<property>
<name>hbase.hstore.blockingWaitTime</name>
<value>90000</value>
<description>
The time an HRegion will block updates for after hitting the StoreFile
limit defined by hbase.hstore.blockingStoreFiles.
After this time has elapsed, the HRegion will stop blocking updates even
if a compaction has not been completed. Default: 90 seconds.
</description>
</property>
<property>
<name>hbase.hstore.compaction.max</name>
<value>10</value>
<description>Max number of HStoreFiles to compact per 'minor' compaction.
</description>
</property>
<property>
<name>hbase.hregion.majorcompaction</name>
<value>86400000</value>
<description>The time (in miliseconds) between 'major' compactions of all
HStoreFiles in a region. Default: 1 day.
Set to 0 to disable automated major compactions.
</description>
</property>
<property>
<name>hbase.mapreduce.hfileoutputformat.blocksize</name>
<value>65536</value>
<description>The mapreduce HFileOutputFormat writes storefiles/hfiles.
This is the minimum hfile blocksize to emit. Usually in hbase, writing
hfiles, the blocksize is gotten from the table schema (HColumnDescriptor)
but in the mapreduce outputformat context, we don't have access to the
schema so get blocksize from Configuration. The smaller you make
the blocksize, the bigger your index and the less you fetch on a
random-access. Set the blocksize down if you have small cells and want
faster random-access of individual cells.
</description>
</property>
<property>
<name>hfile.block.cache.size</name>
<value>0.25</value>
<description>
Percentage of maximum heap (-Xmx setting) to allocate to block cache
used by HFile/StoreFile. Default of 0.25 means allocate 25%.
Set to 0 to disable but it's not recommended.
</description>
</property>
<property>
<name>hbase.hash.type</name>
<value>murmur</value>
<description>The hashing algorithm for use in HashFunction. Two values are
supported now: murmur (MurmurHash) and jenkins (JenkinsHash).
Used by bloom filters.
</description>
</property>
<property>
<name>hfile.block.index.cacheonwrite</name>
<value>false</value>
<description>
This allows to put non-root multi-level index blocks into the block
cache at the time the index is being written.
</description>
</property>
<property>
<name>hbase.regionserver.checksum.verify</name>
<value>false</value>
<description>
Allow hbase to do checksums rather than using hdfs checksums. This is a backwards
incompatible change.
</description>
</property>
<property>
<name>hfile.index.block.max.size</name>
<value>131072</value>
<description>
When the size of a leaf-level, intermediate-level, or root-level
index block in a multi-level block index grows to this size, the
block is written out and a new block is started.
</description>
</property>
<property>
<name>hfile.format.version</name>
<value>2</value>
<description>
The HFile format version to use for new files. Set this to 1 to test
backwards-compatibility. The default value of this option should be
consistent with FixedFileTrailer.MAX_VERSION.
</description>
</property>
<property>
<name>io.storefile.bloom.block.size</name>
<value>131072</value>
<description>
The size in bytes of a single block ("chunk") of a compound Bloom
filter. This size is approximate, because Bloom blocks can only be
inserted at data block boundaries, and the number of keys per data
block varies.
</description>
</property>
<property>
<name>io.storefile.bloom.cacheonwrite</name>
<value>false</value>
<description>
Enables cache-on-write for inline blocks of a compound Bloom filter.
</description>
</property>
<property>
<name>hbase.rs.cacheblocksonwrite</name>
<value>false</value>
<description>
Whether an HFile block should be added to the block cache when the
block is finished.
</description>
</property>
<property>
<name>hbase.rpc.engine</name>
<value>org.apache.hadoop.hbase.ipc.WritableRpcEngine</value>
<description>Implementation of org.apache.hadoop.hbase.ipc.RpcEngine to be
used for client / server RPC call marshalling.
</description>
</property>
<!-- The following properties configure authentication information for
HBase processes when using Kerberos security. There are no default
values, included here for documentation purposes -->
<property>
<name>hbase.master.keytab.file</name>
<value></value>
<description>Full path to the kerberos keytab file to use for logging in
the configured HMaster server principal.
</description>
</property>
<property>
<name>hbase.master.kerberos.principal</name>
<value></value>
<description>Ex. "hbase/_HOST@EXAMPLE.COM". The kerberos principal name
that should be used to run the HMaster process. The principal name should
be in the form: user/hostname@DOMAIN. If "_HOST" is used as the hostname
portion, it will be replaced with the actual hostname of the running
instance.
</description>
</property>
<property>
<name>hbase.regionserver.keytab.file</name>
<value></value>
<description>Full path to the kerberos keytab file to use for logging in
the configured HRegionServer server principal.
</description>
</property>
<property>
<name>hbase.regionserver.kerberos.principal</name>
<value></value>
<description>Ex. "hbase/_HOST@EXAMPLE.COM". The kerberos principal name
that should be used to run the HRegionServer process. The principal name
should be in the form: user/hostname@DOMAIN. If "_HOST" is used as the
hostname portion, it will be replaced with the actual hostname of the
running instance. An entry for this principal must exist in the file
specified in hbase.regionserver.keytab.file
</description>
</property>
<!-- Additional configuration specific to HBase security -->
<property>
<name>hadoop.policy.file</name>
<value>hbase-policy.xml</value>
<description>The policy configuration file used by RPC servers to make
authorization decisions on client requests. Only used when HBase
security is enabled.
</description>
</property>
<property>
<name>hbase.superuser</name>
<value></value>
<description>List of users or groups (comma-separated), who are allowed
full privileges, regardless of stored ACLs, across the cluster.
Only used when HBase security is enabled.
</description>
</property>
<property>
<name>hbase.auth.key.update.interval</name>
<value>86400000</value>
<description>The update interval for master key for authentication tokens
in servers in milliseconds. Only used when HBase security is enabled.
</description>
</property>
<property>
<name>hbase.auth.token.max.lifetime</name>
<value>604800000</value>
<description>The maximum lifetime in milliseconds after which an
authentication token expires. Only used when HBase security is enabled.
</description>
</property>
<property>
<name>zookeeper.session.timeout</name>
<value>180000</value>
<description>ZooKeeper session timeout.
HBase passes this to the zk quorum as suggested maximum time for a
session (This setting becomes zookeeper's 'maxSessionTimeout'). See
http://hadoop.apache.org/zookeeper/docs/current/zookeeperProgrammers.html#ch_zkSessions
"The client sends a requested timeout, the server responds with the
timeout that it can give the client. " In milliseconds.
</description>
</property>
<property>
<name>zookeeper.znode.parent</name>
<value>/hbase-unsecure</value>
<description>Root ZNode for HBase in ZooKeeper. All of HBase's ZooKeeper
files that are configured with a relative path will go under this node.
By default, all of HBase's ZooKeeper file path are configured with a
relative path, so they will all go under this directory unless changed.
</description>
</property>
<property>
<name>zookeeper.znode.rootserver</name>
<value>root-region-server</value>
<description>Path to ZNode holding root region location. This is written by
the master and read by clients and region servers. If a relative path is
given, the parent folder will be ${zookeeper.znode.parent}. By default,
this means the root location is stored at /hbase/root-region-server.
</description>
</property>
<property>
<name>zookeeper.znode.acl.parent</name>
<value>acl</value>
<description>Root ZNode for access control lists.</description>
</property>
<property>
<name>hbase.coprocessor.region.classes</name>
<value></value>
<description>A comma-separated list of Coprocessors that are loaded by
default on all tables. For any override coprocessor method, these classes
will be called in order. After implementing your own Coprocessor, just put
it in HBase's classpath and add the fully qualified class name here.
A coprocessor can also be loaded on demand by setting HTableDescriptor.
</description>
</property>
<property>
<name>hbase.coprocessor.master.classes</name>
<value></value>
<description>A comma-separated list of
org.apache.hadoop.hbase.coprocessor.MasterObserver coprocessors that are
loaded by default on the active HMaster process. For any implemented
coprocessor methods, the listed classes will be called in order. After
implementing your own MasterObserver, just put it in HBase's classpath
and add the fully qualified class name here.
</description>
</property>
<!--
The following three properties are used together to create the list of
host:peer_port:leader_port quorum servers for ZooKeeper.
-->
<property>
<name>hbase.zookeeper.quorum</name>
<value>localhost</value>
<description>Comma separated list of servers in the ZooKeeper Quorum.
For example, "host1.mydomain.com,host2.mydomain.com,host3.mydomain.com".
By default this is set to localhost for local and pseudo-distributed modes
of operation. For a fully-distributed setup, this should be set to a full
list of ZooKeeper quorum servers. If HBASE_MANAGES_ZK is set in hbase-env.sh
this is the list of servers which we will start/stop ZooKeeper on.
</description>
</property>
<property>
<name>hbase.zookeeper.peerport</name>
<value>2888</value>
<description>Port used by ZooKeeper peers to talk to each other.
See http://hadoop.apache.org/zookeeper/docs/r3.1.1/zookeeperStarted.html#sc_RunningReplicatedZooKeeper
for more information.
</description>
</property>
<property>
<name>hbase.zookeeper.leaderport</name>
<value>3888</value>
<description>Port used by ZooKeeper for leader election.
See http://hadoop.apache.org/zookeeper/docs/r3.1.1/zookeeperStarted.html#sc_RunningReplicatedZooKeeper
for more information.
</description>
</property>
<property>
<name>hbase.zookeeper.useMulti</name>
<value>true</value>
<description>Instructs HBase to make use of ZooKeeper's multi-update functionality.
This allows certain ZooKeeper operations to complete more quickly and prevents some issues
with rare ZooKeeper failure scenarios (see the release note of HBASE-6710 for an example).
IMPORTANT: only set this to true if all ZooKeeper servers in the cluster are on version 3.4+
and will not be downgraded. ZooKeeper versions before 3.4 do not support multi-update and will
not fail gracefully if multi-update is invoked (see ZOOKEEPER-1495).
NOTE: this and future versions of HBase are only supported to work with
versions of ZooKeeper with multi support (CDH4+), so it is safe to use ZK.multi.
</description>
</property>
<!-- End of properties used to generate ZooKeeper host:port quorum list. -->
<!--
Beginning of properties that are directly mapped from ZooKeeper's zoo.cfg.
All properties with an "hbase.zookeeper.property." prefix are converted for
ZooKeeper's configuration. Hence, if you want to add an option from zoo.cfg,
e.g. "initLimit=10" you would append the following to your configuration:
<property>
<name>hbase.zookeeper.property.initLimit</name>
<value>10</value>
</property>
-->
<property>
<name>hbase.zookeeper.property.initLimit</name>
<value>10</value>
<description>Property from ZooKeeper's config zoo.cfg.
The number of ticks that the initial synchronization phase can take.
</description>
</property>
<property>
<name>hbase.zookeeper.property.syncLimit</name>
<value>5</value>
<description>Property from ZooKeeper's config zoo.cfg.
The number of ticks that can pass between sending a request and getting an
acknowledgment.
</description>
</property>
<property>
<name>hbase.zookeeper.property.dataDir</name>
<value>${hbase.tmp.dir}/zookeeper</value>
<description>Property from ZooKeeper's config zoo.cfg.
The directory where the snapshot is stored.
</description>
</property>
<property>
<name>hbase.zookeeper.property.clientPort</name>
<value>2181</value>
<description>Property from ZooKeeper's config zoo.cfg.
The port at which the clients will connect.
</description>
</property>
<property>
<name>hbase.zookeeper.property.maxClientCnxns</name>
<value>300</value>
<description>Property from ZooKeeper's config zoo.cfg.
Limit on number of concurrent connections (at the socket level) that a
single client, identified by IP address, may make to a single member of
the ZooKeeper ensemble. Set high to avoid zk connection issues running
standalone and pseudo-distributed.
</description>
</property>
<!-- End of properties that are directly mapped from ZooKeeper's zoo.cfg -->
<property>
<name>hbase.rest.port</name>
<value>8080</value>
<description>The port for the HBase REST server.</description>
</property>
<property>
<name>hbase.rest.readonly</name>
<value>false</value>
<description>
Defines the mode the REST server will be started in. Possible values are:
false: All HTTP methods are permitted - GET/PUT/POST/DELETE.
true: Only the GET method is permitted.
</description>
</property>
<property skipInDoc="true">
<name>hbase.defaults.for.version</name>
<value>0.94.2-cdh4.2.1</value>
<description>
This defaults file was compiled for version 0.94.2-cdh4.2.1. This variable is used
to make sure that a user doesn't have an old version of hbase-default.xml on the
classpath.
</description>
</property>
<property>
<name>hbase.defaults.for.version.skip</name>
<value>true</value>
<description>
Set to true to skip the 'hbase.defaults.for.version' check.
Setting this to true can be useful in contexts other than
the other side of a maven generation; i.e. running in an
ide. You'll want to set this boolean to true to avoid
seeing the RuntimException complaint: "hbase-default.xml file
seems to be for and old version of HBase (0.94.2-cdh4.2.1), this
version is X.X.X-SNAPSHOT"
</description>
</property>
<property>
<name>hbase.coprocessor.abortonerror</name>
<value>false</value>
<description>
Set to true to cause the hosting server (master or regionserver) to
abort if a coprocessor throws a Throwable object that is not IOException or
a subclass of IOException. Setting it to true might be useful in development
environments where one wants to terminate the server as soon as possible to
simplify coprocessor failure analysis.
</description>
</property>
<property>
<name>hbase.online.schema.update.enable</name>
<value>false</value>
<description>
Set true to enable online schema changes. This is an experimental feature.
There are known issues modifying table schemas at the same time a region
split is happening so your table needs to be quiescent or else you have to
be running with splits disabled.
</description>
</property>
<property>
<name>dfs.support.append</name>
<value>true</value>
<description>Does HDFS allow appends to files?
This is an hdfs config. set in here so the hdfs client will do append support.
You must ensure that this config. is true serverside too when running hbase
(You will have to restart your cluster after setting it).
</description>
</property>
<property>
<name>hbase.thrift.minWorkerThreads</name>
<value>16</value>
<description>
The "core size" of the thread pool. New threads are created on every
connection until this many threads are created.
</description>
</property>
<property>
<name>hbase.thrift.maxWorkerThreads</name>
<value>1000</value>
<description>
The maximum size of the thread pool. When the pending request queue
overflows, new threads are created until their number reaches this number.
After that, the server starts dropping connections.
</description>
</property>
<property>
<name>hbase.thrift.maxQueuedRequests</name>
<value>1000</value>
<description>
The maximum number of pending Thrift connections waiting in the queue. If
there are no idle threads in the pool, the server queues requests. Only
when the queue overflows, new threads are added, up to
hbase.thrift.maxQueuedRequests threads.
</description>
</property>
<property>
<name>hbase.offheapcache.percentage</name>
<value>0</value>
<description>
The amount of off heap space to be allocated towards the experimental
off heap cache. If you desire the cache to be disabled, simply set this
value to 0.
</description>
</property>
<property>
<name>hbase.data.umask.enable</name>
<value>false</value>
<description>Enable, if true, that file permissions should be assigned
to the files written by the regionserver
</description>
</property>
<property>
<name>hbase.data.umask</name>
<value>000</value>
<description>File permissions that should be used to write data
files when hbase.data.umask.enable is true
</description>
</property>
<property>
<name>hbase.metrics.showTableName</name>
<value>true</value>
<description>Whether to include the prefix "tbl.tablename" in per-column family metrics.
If true, for each metric M, per-cf metrics will be reported for tbl.T.cf.CF.M, if false,
per-cf metrics will be aggregated by column-family across tables, and reported for cf.CF.M.
In both cases, the aggregated metric M across tables and cfs will be reported.
</description>
</property>
<property>
<name>hbase.table.archive.directory</name>
<value>.archive</value>
<description>Per-table directory name under which to backup files for a
table. Files are moved to the same directories as they would be under the
table directory, but instead are just one level lower (under
table/.archive/... rather than table/...). Currently only applies to HFiles.</description>
</property>
<property>
<name>hbase.master.hfilecleaner.plugins</name>
<value>org.apache.hadoop.hbase.master.cleaner.TimeToLiveHFileCleaner</value>
<description>A comma-separated list of HFileCleanerDelegate invoked by
the HFileCleaner service. These HFiles cleaners are called in order,
so put the cleaner that prunes the most files in front. To
implement your own HFileCleanerDelegate, just put it in HBase's classpath
and add the fully qualified class name here. Always add the above
default log cleaners in the list as they will be overwritten in hbase-site.xml.
</description>
</property>
<property>
<name>hbase.rest.threads.max</name>
<value>100</value>
<description>
The maximum number of threads of the REST server thread pool.
Threads in the pool are reused to process REST requests. This
controls the maximum number of requests processed concurrently.
It may help to control the memory used by the REST server to
avoid OOM issues. If the thread pool is full, incoming requests
will be queued up and wait for some free threads. The default
is 100.
</description>
</property>
<property>
<name>hbase.rest.threads.min</name>
<value>2</value>
<description>
The minimum number of threads of the REST server thread pool.
The thread pool always has at least these number of threads so
the REST server is ready to serve incoming requests. The default
is 2.
</description>
</property>
</configuration>