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https://issues.apache.org/jira/browse/HBASE-12274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-12274:
---------------------------
Attachment: 12274-v1.txt
Tentative patch.
Seeking comments.
> Race between RegionScannerImpl#nextInternal() and RegionScannerImpl#close()
> may produce null pointer exception
> --------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-12274
> URL: https://issues.apache.org/jira/browse/HBASE-12274
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.6.1
> Reporter: Ted Yu
> Attachments: 12274-v1.txt
>
>
> I saw the following in region server log:
> {code}
> 2014-10-15 03:28:36,976 ERROR
> [B.DefaultRpcServer.handler=0,queue=0,port=60020] ipc.RpcServer: Unexpected
> throwable object
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5023)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:4932)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:4923)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3245)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29994)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2078)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:108)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:114)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:94)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> This is where the NPE happened:
> {code}
> // Let's see what we have in the storeHeap.
> KeyValue current = this.storeHeap.peek();
> {code}
> The cause was race between nextInternal(called through nextRaw) and close
> methods.
> nextRaw() is not synchronized.
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