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https://issues.apache.org/jira/browse/HBASE-5532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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terry zhang updated HBASE-5532:
-------------------------------
Attachment: HBASE-5532-v2.patch
add a read lock during isMajorCompaction() to avoid race condition.
> 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-v2.patch, 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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