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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12274) Race between RegionScannerImpl#nextInternal() and RegionScannerImpl#close() may produce null pointer exception
Date Fri, 31 Oct 2014 07:16:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191527#comment-14191527
] 

Hudson commented on HBASE-12274:
--------------------------------

SUCCESS: Integrated in HBase-0.98 #643 (See [https://builds.apache.org/job/HBase-0.98/643/])
HBASE-12274 addendum removes synchronized keyword for nextRaw() (tedyu: rev f1cabd378512f1b18003afed9782d88d022d6850)
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java


> 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
>            Assignee: Ted Yu
>             Fix For: 2.0.0, 0.98.8, 0.99.2
>
>         Attachments: 12274-0.98.addendum, 12274-region-server.log, 12274-v2.txt, 12274-v2.txt,
12274-v3.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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