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From Jeff Cunningham <jcunning...@splicemachine.com>
Subject Re: [jira] [Commented] (HBASE-14266) RegionServers have a lock contention of Configuration.getProps
Date Fri, 23 Oct 2015 18:52:10 GMT
Please do Andrew.  Thanks.

> On Oct 23, 2015, at 1:49 PM, Andrew Purtell (JIRA) <jira@apache.org> wrote:
> 
> 
>    [ https://issues.apache.org/jira/browse/HBASE-14266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14971601#comment-14971601
] 
> 
> Andrew Purtell commented on HBASE-14266:
> ----------------------------------------
> 
> Are you still working on this [~graziergeek]? If not I can take it. 
> 
>> 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
>>           Assignee: Jeff Cunningham
>>           Priority: Critical
>>        Attachments: HBASE-14266.patch, 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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