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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5532) get NPE during MajorCompactionChecker
Date Tue, 06 Mar 2012 14:49:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223291#comment-13223291

Zhihong Yu commented on HBASE-5532:

Which version of HBase were you using ?
> get NPE during MajorCompactionChecker 
> --------------------------------------
>                 Key: HBASE-5532
>                 URL: https://issues.apache.org/jira/browse/HBASE-5532
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: terry zhang
>         Attachments: HBASE-5532.patch
> We found error log (NullPointerException) below on our online cluster:
> 2012-03-05 00:17:09,592 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer$MajorCompactionChecker:
Caught exception
> java.lang.NullPointerException
>         at org.apache.hadoop.hbase.regionserver.Store.isMajorCompaction(Store.java:878)
>         at org.apache.hadoop.hbase.regionserver.Store.isMajorCompaction(Store.java:857)
>         at org.apache.hadoop.hbase.regionserver.HRegion.isMajorCompaction(HRegion.java:3017)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer$MajorCompactionChecker.chore(HRegionServer.java:1172)
>         at org.apache.hadoop.hbase.Chore.run(Chore.java:66)
> After Check the code we found although it already check whether store files has null
reader at the begin of the function(isMajorCompaction), but it still has some possibility
the reader is closed before it return(eg mini compaction). So we need to check store file
reader before we use it to avoid this NPE

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