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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2797) Another NPE in ReadWriteConsistencyControl
Date Wed, 07 Jul 2010 18:50:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886028#action_12886028
] 

Jean-Daniel Cryans commented on HBASE-2797:
-------------------------------------------

Pranav,

Ryan posted a patch for review here http://review.hbase.org/r/241/diff/

Can you try your test with that patch on? If it works, can you +1 the patch?

> Another NPE in ReadWriteConsistencyControl
> ------------------------------------------
>
>                 Key: HBASE-2797
>                 URL: https://issues.apache.org/jira/browse/HBASE-2797
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.5
>            Reporter: Dave Latham
>            Assignee: ryan rawson
>            Priority: Blocker
>             Fix For: 0.20.6
>
>         Attachments: testDebugNPE.diff
>
>
> This occurred on a cluster with 46 slaves, running a couple MR jobs.  One doing heavy
writes copying everything from one table to a new table with a different schema.  After one
regionserver went down, about 40 of them died within an hour before it was caught and the
jobs stopped.  Let me know if any other piece of context would be particularly helpful.
> This exception appears in the .out file:
> Exception in thread "regionserver/192.168.41.2:60020" java.lang.NullPointerException
>         at org.apache.hadoop.hbase.regionserver.ReadWriteConsistencyControl.getThreadReadPoint(ReadWriteConsistencyControl.java:40)
>         at org.apache.hadoop.hbase.regionserver.MemStore$MemStoreScanner.getNext(MemStore.java:532)
>         at org.apache.hadoop.hbase.regionserver.MemStore$MemStoreScanner.seek(MemStore.java:558)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:320)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.checkReseek(StoreScanner.java:306)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.peek(StoreScanner.java:143)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:127)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:117)
>         at java.util.PriorityQueue.siftDownUsingComparator(PriorityQueue.java:644)
>         at java.util.PriorityQueue.siftDown(PriorityQueue.java:612)
>         at java.util.PriorityQueue.poll(PriorityQueue.java:523)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.close(KeyValueHeap.java:151)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner.close(HRegion.java:1971)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.closeAllRegions(HRegionServer.java:1610)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:621)
>         at java.lang.Thread.run(Thread.java:619)

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