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From "James Kennedy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3524) NPE from CompactionChecker
Date Fri, 11 Feb 2011 03:01:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993320#comment-12993320
] 

James Kennedy commented on HBASE-3524:
--------------------------------------

I found this in the hbase.log:


[10/02/11 18:37:29] 44386  [1297391814420-0] WARN  adoop.hbase.regionserver.Store  - Skipping
hdfs://localhost:7701/hbase/.META./1028785192/info/2685681686584745388 because its empty.
HBASE-646 DATA LOSS?

So perhaps this issue is a symptom of corrupt meta data. HOW can I fix this!?

> 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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