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stack commented on HBASE-14266: ------------------------------- Tried going back to branch-1.1 but a few bits wouldn't go in... If someone wants it back in 1.1, make a patch to backport. Thanks. > 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: Andrew Purtell > Priority: Critical > Fix For: 2.0.0, 1.2.0, 1.3.0 > > Attachments: 14266v2.patch, 14266v3.patch, 14266v3.txt, > HBASE-14266.patch, Screen Shot 2015-10-23 at 5.11.46 PM.png, Screen Shot > 2015-10-23 at 5.24.03 PM.png, 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)