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Posted to issues@hbase.apache.org by "Jean-Daniel Cryans (JIRA)" <ji...@apache.org> on 2010/07/07 20:50:50 UTC
[jira] Commented: (HBASE-2797) Another NPE in
ReadWriteConsistencyControl
[ 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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