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From: "John Leach (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-14266) RegionServers have a lock
 contention of Configuration.getProps
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    [ https://issues.apache.org/jira/browse/HBASE-14266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906422#comment-14906422 ] 

John Leach commented on HBASE-14266:
------------------------------------

HBASE-12912 is a similar issue.  I am running tests right now for a fix, if clean will push patch.  

> RegionServers have a lock contention of Configuration.getProps
> --------------------------------------------------------------
>
>                 Key: HBASE-14266
>                 URL: https://issues.apache.org/jira/browse/HBASE-14266
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>         Environment: hbase-0.98.6-cdh5.3.1
>            Reporter: Toshihiro Suzuki
>         Attachments: thread_dump.txt
>
>
> Here's an extract from thread dump of the RegionServer of my cluster:
> {code}
> ...
> Thread 267 (RW.default.readRpcServer.handler=184,queue=15,port=60020):
>   State: BLOCKED
>   Blocked count: 204028
>   Waited count: 9702639
>   Blocked on org.apache.hadoop.conf.Configuration@5a5e3da
>   Blocked by 250 (RW.default.readRpcServer.handler=167,queue=18,port=60020)
>   Stack:
>     org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2250)
>     org.apache.hadoop.conf.Configuration.get(Configuration.java:861)
>     org.apache.hadoop.conf.Configuration.getTrimmed(Configuration.java:880)
>     org.apache.hadoop.conf.Configuration.getBoolean(Configuration.java:1281)
>     org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:138)
>     org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:157)
>     org.apache.hadoop.hbase.regionserver.HStore.createScanner(HStore.java:1804)
>     org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:1794)
>     org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:3852)
>     org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1952)
>     org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1938)
>     org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1915)
>     org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4872)
>     org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4847)
>     org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:2918)
>     org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29921)
>     org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2031)
>     org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:108)
>     org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:116)
>     org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:96)
> ...
> {code}
> There are such many threads in the thread dump.
> I think that RegionServers have a lock contention which causes performance issue.



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