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https://issues.apache.org/jira/browse/HBASE-13097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhangduo updated HBASE-13097:
-----------------------------
Description:
In some unit tests(such as TestAcidGuarantees) we create multiple Connection
instance. If we use AsyncRpcClient, then there will be multiple netty Bootstrap
and every Bootstrap has its own PooledByteBufAllocator.
I haven't read the code clearly but it uses some threadlocal technics and jmap
shows io.netty.buffer.PoolThreadCache$MemoryRegionCache$Entry is the biggest
things on Heap.
See
https://builds.apache.org/job/HBase-TRUNK/6168/artifact/hbase-server/target/surefire-reports/org.apache.hadoop.hbase.TestAcidGuarantees-output.txt
{noformat}
2015-02-24 23:50:29,704 WARN [JvmPauseMonitor]
util.JvmPauseMonitor$Monitor(167): Detected pause in JVM or host machine (eg
GC): pause of approximately 20133ms
GC pool 'PS MarkSweep' had collection(s): count=15 time=55525ms
{noformat}
was:
In some unit tests(such as TestAcidGuarantees) we create multiple Connection
instance. If we use AsyncRpcClient, then there will be multiple netty Bootstrap
and every Bootstrap has its own PooledByteBufAllocator.
Its default max cached buffer size is 32M, so it is easy to OOM if we create
many Connection instance.
See
https://builds.apache.org/job/HBase-TRUNK/6168/artifact/hbase-server/target/surefire-reports/org.apache.hadoop.hbase.TestAcidGuarantees-output.txt
{noformat}
2015-02-24 23:50:29,704 WARN [JvmPauseMonitor]
util.JvmPauseMonitor$Monitor(167): Detected pause in JVM or host machine (eg
GC): pause of approximately 20133ms
GC pool 'PS MarkSweep' had collection(s): count=15 time=55525ms
{noformat}
> Netty PooledByteBufAllocator cause OOM in some unit test
> --------------------------------------------------------
>
> Key: HBASE-13097
> URL: https://issues.apache.org/jira/browse/HBASE-13097
> Project: HBase
> Issue Type: Bug
> Components: IPC/RPC, test
> Affects Versions: 2.0.0, 1.1.0
> Reporter: zhangduo
>
> In some unit tests(such as TestAcidGuarantees) we create multiple Connection
> instance. If we use AsyncRpcClient, then there will be multiple netty
> Bootstrap and every Bootstrap has its own PooledByteBufAllocator.
> I haven't read the code clearly but it uses some threadlocal technics and
> jmap shows io.netty.buffer.PoolThreadCache$MemoryRegionCache$Entry is the
> biggest things on Heap.
> See
> https://builds.apache.org/job/HBase-TRUNK/6168/artifact/hbase-server/target/surefire-reports/org.apache.hadoop.hbase.TestAcidGuarantees-output.txt
> {noformat}
> 2015-02-24 23:50:29,704 WARN [JvmPauseMonitor]
> util.JvmPauseMonitor$Monitor(167): Detected pause in JVM or host machine (eg
> GC): pause of approximately 20133ms
> GC pool 'PS MarkSweep' had collection(s): count=15 time=55525ms
> {noformat}
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