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From "Toshihiro Suzuki (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14266) RegionServers have a lock contention of Configuration.getProps
Date Thu, 20 Aug 2015 07:24:45 GMT
Toshihiro Suzuki created HBASE-14266:
----------------------------------------

             Summary: 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


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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