[jira] Commented: (HBASE-2740) NPE in ReadWriteConsistencyControl

["ryan rawson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879588#action_12879588 ] 

ryan rawson commented on HBASE-2740:
------------------------------------

this is because we are calling updateReaders() on a Scanner that was already 'reset'.  The updateReaders should guard against this condition.

> NPE in ReadWriteConsistencyControl
> ----------------------------------
>
>                 Key: HBASE-2740
>                 URL: https://issues.apache.org/jira/browse/HBASE-2740
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Dave Latham
>            Assignee: ryan rawson
>            Priority: Critical
>             Fix For: 0.20.6
>
>
> A region server running 0.20.5rc3 died with this exception:
> 2010-06-16 12:19:03,694 FATAL org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Replay of hlog required. Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region: xxxxxxxxxx,1272579746382
>         at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1041)
>         at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:896)
>         at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:262)
>         at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:149)
> Caused by: 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:311)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.checkReseek(StoreScanner.java:297)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.peek(StoreScanner.java:143)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.updateReaders(StoreScanner.java:283)
>         at org.apache.hadoop.hbase.regionserver.Store.notifyChangedReadersObservers(Store.java:621)
>         at org.apache.hadoop.hbase.regionserver.Store.updateStorefiles(Store.java:607)
>         at org.apache.hadoop.hbase.regionserver.Store.access$200(Store.java:88)
>         at org.apache.hadoop.hbase.regionserver.Store$StoreFlusherImpl.commit(Store.java:1605)
>         at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1019)
>         ... 3 more

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