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From Pere Kyle <p...@whisper.sh>
Subject Hbase Unusable after auto split to 1024 regions
Date Thu, 06 Nov 2014 05:29:04 GMT
Hello,

Recently our cluster which has been running fine for 2 weeks split to 1024 regions at 1GB
per region, after this split the cluster is unusable. Using the performance benchmark I was
getting a little better than 100 w/s, whereas before it was 5000 w/s. There are 15 nodes of
m2.2xlarge with 8GB heap reserved for Hbase

Any Ideas? I am stumped:

Thanks,
Pere

Here is the current 
hbase-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
    <name>hbase.snapshot.enabled</name>
    <value>true</value>
  </property>
  <property><name>fs.hdfs.impl</name><value>emr.hbase.fs.BlockableFileSystem</value></property>
  <property><name>hbase.regionserver.handler.count</name><value>50</value></property>
  <property><name>hbase.cluster.distributed</name><value>true</value></property>
  <property><name>hbase.tmp.dir</name><value>/mnt/var/lib/hbase/tmp-data</value></property>
  <property><name>hbase.master.wait.for.log.splitting</name><value>true</value></property>
  <property><name>hbase.hregion.memstore.flush.size</name><value>134217728</value></property>
  <property><name>hbase.hregion.max.filesize</name><value>5073741824</value></property>
  <property><name>zookeeper.session.timeout</name><value>60000</value></property>
  <property><name>hbase.thrift.maxQueuedRequests</name><value>0</value></property>
  <property><name>hbase.client.scanner.caching</name><value>1000</value></property>
  <property><name>hbase.hregion.memstore.block.multiplier</name><value>4</value></property>
</configuration>

hbase-env.sh
# The maximum amount of heap to use, in MB. Default is 1000.
export HBASE_HEAPSIZE=8000

# Extra Java runtime options.
# Below are what we set by default.  May only work with SUN JVM.
# For more on why as well as other possible settings,
# see http://wiki.apache.org/hadoop/PerformanceTuning
export HBASE_OPTS="-XX:+UseConcMarkSweepGC”

hbase-env.sh
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