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https://issues.apache.org/jira/browse/HBASE-2797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886149#action_12886149
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Pranav Khaitan commented on HBASE-2797:
---------------------------------------
This patch doesn't fix the error I was getting. I see that the fix was only in
the peek function. However, the bug I am getting doesnt even touch the peek
function. Just instantiating StoreScanner() gives that error. It is possible
that the instantiation is not done in the right context but even then I would
not expect this kind of error. I have attached a diff file which contains the
function I wrote for this bug (its just 4 lines)
> 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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