hbase.rootdir
file:///tmp/hbase-${user.name}/hbase
The directory shared by region servers.
Should be fully-qualified to include the filesystem to use.
E.g: hdfs://NAMENODE_SERVER:PORT/HBASE_ROOTDIR
hbase.master.port
60000
The port master should bind to.
hbase.cluster.distributed
false
The mode the cluster will be in. Possible values are
false: standalone and pseudo-distributed setups with managed Zookeeper
true: fully-distributed with unmanaged Zookeeper Quorum (see hbase-env.sh)
hbase.tmp.dir
/tmp/hbase-${user.name}
Temporary directory on the local filesystem.
hbase.master.info.port
60010
The port for the hbase master web UI
Set to -1 if you do not want the info server to run.
hbase.master.info.bindAddress
0.0.0.0
The address for the hbase master web UI
hbase.client.write.buffer
2097152
Size of the 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 reduces the number of RPC.
For an estimate of server-side memory-used, evaluate
hbase.client.write.buffer * hbase.regionserver.handler.count
hbase.master.meta.thread.rescanfrequency
60000
How long the HMaster sleeps (in milliseconds) between scans of
the root and meta tables.
hbase.master.lease.period
120000
HMaster server lease period in milliseconds. Default is
120 seconds. Region servers must report in within this period else
they are considered dead. On loaded cluster, may need to up this
period.
hbase.regionserver.port
60020
The port an HBase region server binds to.
hbase.regionserver.info.port
60030
The port for the hbase regionserver web UI
Set to -1 if you do not want the info server to run.
hbase.regionserver.info.port.auto
false
Info server auto port bind. Enables automatic port
search if hbase.regionserver.info.port is already in use.
Useful for testing, turned off by default.
hbase.regionserver.info.bindAddress
0.0.0.0
The address for the hbase regionserver web UI
hbase.regionserver.class
org.apache.hadoop.hbase.ipc.HRegionInterface
An interface that is assignable to HRegionInterface. Used in HClient for
opening proxy to remote region server.
hbase.client.pause
2000
General client pause value. Used mostly as value to wait
before running a retry of a failed get, region lookup, etc.
hbase.client.retries.number
10
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.
hbase.client.scanner.caching
1
Number of rows that will be fetched when calling next
on a scanner if it is not served from 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.
hbase.regionserver.lease.period
60000
HRegion server lease period in milliseconds. Default is
60 seconds. Clients must report in within this period else they are
considered dead.
hbase.regionserver.handler.count
10
Count of RPC Server instances spun up on RegionServers
Same property is used by the HMaster for count of master handlers.
Default is 10.
hbase.regionserver.msginterval
3000
Interval between messages from the RegionServer to HMaster
in milliseconds. Default is 3 seconds.
hbase.regionserver.flushlogentries
100
Sync the HLog to the HDFS when it has accumulated this many
entries. Default 100. Value is checked on every HLog.append
hbase.regionserver.optionallogflushinterval
10000
Sync the HLog to the HDFS after this interval if it has not
accumulated enough entries to trigger a sync. Default 10 seconds. Units:
milliseconds.
hbase.regionserver.logroll.period
3600000
Period at which we will roll the commit log.
hbase.regionserver.thread.splitcompactcheckfrequency
20000
How often a region server runs the split/compaction check.
hbase.regionserver.nbreservationblocks
4
The number of reservation blocks which are used to prevent
unstable region servers caused by an OOME.
hbase.zookeeper.dns.interface
default
The name of the Network Interface from which a ZooKeeper server
should report its IP address.
hbase.zookeeper.dns.nameserver
default
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.
hbase.regionserver.dns.interface
default
The name of the Network Interface from which a region server
should report its IP address.
hbase.regionserver.dns.nameserver
default
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.
hbase.master.dns.interface
default
The name of the Network Interface from which a master
should report its IP address.
hbase.master.dns.nameserver
default
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.
hbase.regionserver.global.memstore.upperLimit
0.4
Maximum size of all memstores in a region server before new
updates are blocked and flushes are forced. Defaults to 40% of heap
hbase.regionserver.global.memstore.lowerLimit
0.25
When memstores are being forced to flush to make room in
memory, keep flushing until we hit this mark. Defaults to 30% 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.
hbase.hbasemaster.maxregionopen
120000
Period to wait for a region open. If regionserver
takes longer than this interval, assign to a new regionserver.
hbase.regions.percheckin
10
Maximum number of regions that can be assigned in a single go
to a region server.
hbase.server.thread.wakefrequency
10000
Time to sleep in between searches for work (in milliseconds).
Used as sleep interval by service threads such as META scanner and log roller.
hbase.hregion.memstore.flush.size
67108864
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.
hbase.hregion.memstore.block.multiplier
2
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.
hbase.hregion.max.filesize
268435456
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: 256M.
hbase.hstore.compactionThreshold
3
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.
During a compaction, updates cannot be flushed to disk. Long
compactions require memory sufficient to carry the logging of
all updates across the duration of the compaction.
If too large, clients timeout during compaction.
hbase.hstore.blockingStoreFiles
7
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.
hbase.hstore.blockingWaitTime
90000
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.
hbase.hstore.compaction.max
10
Max number of HStoreFiles to compact per 'minor' compaction.
hbase.hregion.majorcompaction
86400000
The time (in miliseconds) between 'major' compactions of all
HStoreFiles in a region. Default: 1 day.
hbase.regions.slop
0.1
Rebalance if regionserver has average + (average * slop) regions.
Default is 10% slop.
hfile.min.blocksize.size
65536
Minimum store file block size. The smaller you make this, the
bigger your index and the less you fetch on a random-access. Set size down
if you have small cells and want faster random-access of individual cells.
hfile.block.cache.size
0.2
Percentage of maximum heap (-Xmx setting) to allocate to block cache
used by HFile/StoreFile. Default of 0.2 means allocate 20%.
Set to 0 to disable.
hbase.hstore.blockCache.blockSize
16384
The size of each block in the block cache.
Enable blockcaching on a per column family basis; see the BLOCKCACHE setting
in HColumnDescriptor. Blocks are kept in a java Soft Reference cache so are
let go when high pressure on memory. Block caching is not enabled by default.
hbase.hash.type
murmur
The hashing algorithm for use in HashFunction. Two values are
supported now: murmur (MurmurHash) and jenkins (JenkinsHash).
zookeeper.session.timeout
60000
ZooKeeper session timeout. This option is not used by HBase
directly, it is for the internals of ZooKeeper. HBase merely passes it in
whenever a connection is established to ZooKeeper. It is used by ZooKeeper
for hearbeats. In milliseconds.
zookeeper.retries
5
How many times to retry connections to ZooKeeper. Used for
reading/writing root region location, checking/writing out of safe mode.
Used together with ${zookeeper.pause} in an exponential backoff fashion
when making queries to ZooKeeper.
zookeeper.pause
2000
Sleep time between retries to ZooKeeper. In milliseconds. Used
together with ${zookeeper.retries} in an exponential backoff fashion when
making queries to ZooKeeper.
zookeeper.znode.parent
/hbase
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.
zookeeper.znode.rootserver
root-region-server
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.
zookeeper.znode.safemode
safe-mode
Path to ephemeral ZNode signifying cluster is out of safe mode.
This is created by the master when scanning is done. Clients wait for this
node before querying the cluster. If a relative path is given, the parent
folder will be ${zookeeper.znode.parent}. By default, this means the safe
mode flag is stored at /hbase/safe-mode.
hbase.zookeeper.quorum
localhost
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.
hbase.zookeeper.peerport
2888
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.
hbase.zookeeper.leaderport
3888
Port used by ZooKeeper for leader election.
See http://hadoop.apache.org/zookeeper/docs/r3.1.1/zookeeperStarted.html#sc_RunningReplicatedZooKeeper
for more information.
hbase.zookeeper.property.tickTime
2000
Property from ZooKeeper's config zoo.cfg.
The number of milliseconds of each tick.
hbase.zookeeper.property.initLimit
10
Property from ZooKeeper's config zoo.cfg.
The number of ticks that the initial synchronization phase can take.
hbase.zookeeper.property.syncLimit
5
Property from ZooKeeper's config zoo.cfg.
The number of ticks that can pass between sending a request and getting an
acknowledgment.
hbase.zookeeper.property.dataDir
${hbase.tmp.dir}/zookeeper
Property from ZooKeeper's config zoo.cfg.
The directory where the snapshot is stored.
hbase.zookeeper.property.clientPort
2181
Property from ZooKeeper's config zoo.cfg.
The port at which the clients will connect.
hbase.zookeeper.property.maxClientCnxns
30
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.