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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HBASE-1107) NPE in HStoreScanner.updateReaders
Date Fri, 13 Mar 2009 23:44:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681940#action_12681940
] 

Dave Latham edited comment on HBASE-1107 at 3/13/09 4:44 PM:
-------------------------------------------------------------

This problem has been taking down regionservers regularly for me as well.  Running hbase 0.19.0
on hadoop 0.19.0 with 4 slaves.  It's becoming a major stability issue for us.

2009-03-13 16:30:47,728 FATAL org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay
of hlog required. Forcing server shutdown
org.apache.hadoop.hbase.DroppedSnapshotException: region: sessions,^@^@^@^@^@^@^Cd^@^@^A^_�x�q^@.IPHONEc8532c72874b66d1165c2f62ed91ef353eb9,1235185327583
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:896)
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:789)
        at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:227)
        at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:137)
Caused by: java.lang.NullPointerException
        at org.apache.hadoop.hbase.regionserver.HStoreScanner.updateReaders(HStoreScanner.java:330)
        at org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:737)
        at org.apache.hadoop.hbase.regionserver.HStore.updateReaders(HStore.java:725)
        at org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:694)
        at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:630)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:881)
        ... 3 more

      was (Author: davelatham):
    This problem has been taking down regionservers regularly for me as well.  Running hbase
0.19.0 on hadoop 0.19.0 with 4 slaves.

2009-03-13 16:30:47,728 FATAL org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay
of hlog required. Forcing server shutdown
org.apache.hadoop.hbase.DroppedSnapshotException: region: sessions,^@^@^@^@^@^@^Cd^@^@^A^_�x�q^@.IPHONEc8532c72874b66d1165c2f62ed91ef353eb9,1235185327583
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:896)
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:789)
        at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:227)
        at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:137)
Caused by: java.lang.NullPointerException
        at org.apache.hadoop.hbase.regionserver.HStoreScanner.updateReaders(HStoreScanner.java:330)
        at org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:737)
        at org.apache.hadoop.hbase.regionserver.HStore.updateReaders(HStore.java:725)
        at org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:694)
        at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:630)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:881)
        ... 3 more
  
> NPE in HStoreScanner.updateReaders
> ----------------------------------
>
>                 Key: HBASE-1107
>                 URL: https://issues.apache.org/jira/browse/HBASE-1107
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.19.1, 0.20.0
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Blocker
>         Attachments: 1107-1.patch
>
>
> 2009-01-01 23:55:41,629 FATAL org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay
of hlog required. Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region: content,cff13605e2ea6ce0b221ac864687bf08,1230777531253
>         at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:880)
>         at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:773)
>         at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:227)
>         at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:137)
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.regionserver.HStoreScanner.updateReaders(HStoreScanner.java:322)
>         at org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:737)
>         at org.apache.hadoop.hbase.regionserver.HStore.updateReaders(HStore.java:725)
>         at org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:694)
>         at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:630)
>         at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:865)
>         ... 3 more

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