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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6839) Operations may be executed without rowLock
Date Thu, 20 Sep 2012 01:59:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459291#comment-13459291
] 

chunhui shen commented on HBASE-6839:
-------------------------------------

@ram
obtainRowLock may return null
but in the increment, delete,append, we won't handle the null case,
and the result is operations is executed, but finally throw NPE when release row lock
{2012-09-17 13:51:22,300 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer:
java.lang.NullPointerException
        at java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:922)
        at org.apache.hadoop.hbase.regionserver.HRegion.releaseRowLock(HRegion.java:2522)
        at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1668)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:2075)
        at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:603)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1348)
}
                
> Operations may be executed without rowLock
> ------------------------------------------
>
>                 Key: HBASE-6839
>                 URL: https://issues.apache.org/jira/browse/HBASE-6839
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>            Priority: Critical
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6839.patch
>
>
> HRegion#internalObtainRowLock will return null if timed out,
> but many place which call this method don't handle this case
> The bad result is operation will be executed even if it havn't obtained the row lock.
Such as put、delete、increment。。。

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