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From "James Kennedy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3524) NPE from CompactionChecker
Date Fri, 11 Feb 2011 07:19:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993365#comment-12993365

James Kennedy commented on HBASE-3524:

> What is the creation time of your empty file? When is it from? Maybe it's old?

Let me re-reproduce these issues from scratch tomorrow morning.

> NPE from CompactionChecker
> --------------------------
>                 Key: HBASE-3524
>                 URL: https://issues.apache.org/jira/browse/HBASE-3524
>             Project: HBase
>          Issue Type: Bug
>            Reporter: James Kennedy
>             Fix For: 0.90.2
> I recently updated production data to use HBase 0.90.0.
> Now I'm periodically seeing:
> [10/02/11 17:23:27] 30076066 [mpactionChecker] ERROR nServer$MajorCompactionChecker 
- Caught exception
> java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.regionserver.Store.isMajorCompaction(Store.java:832)
> 	at org.apache.hadoop.hbase.regionserver.Store.isMajorCompaction(Store.java:810)
> 	at org.apache.hadoop.hbase.regionserver.HRegion.isMajorCompaction(HRegion.java:2800)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer$MajorCompactionChecker.chore(HRegionServer.java:1047)
> 	at org.apache.hadoop.hbase.Chore.run(Chore.java:66)
> The only negative effect is that this is interrupting compactions from happening. But
that is pretty serious and this might be a sign of data corruption?
> Maybe it's just my data, but this task should at least involve improving the handling
to catch the NPE and still iterate through the other onlineRegions that might compact without
error.  The MajorCompactionChecker.chore() method only catches IOExceptions and so this NPE
breaks out of that loop. 

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