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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1076) CME in HStore.notifyChangedReadersObservers
Date Thu, 01 Jan 2009 02:16:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660173#action_12660173
] 

Andrew Purtell commented on HBASE-1076:
---------------------------------------

+1 on the patch. Strategy of it is sound. Haven't seen the CME on my cluster after heavy testing
for 12 hours. Will continue to watch for it. Suggest resolving this issue. We can reopen it
if necessary.

> CME in HStore.notifyChangedReadersObservers
> -------------------------------------------
>
>                 Key: HBASE-1076
>                 URL: https://issues.apache.org/jira/browse/HBASE-1076
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.19.0
>            Reporter: Andrew Purtell
>            Priority: Blocker
>
> Running latest trunk plus jimk's patch for HBASE-543: 
> 2008-12-21 12:47:31,741 DEBUG org.apache.hadoop.hbase.regionserver.HStoreScanner
> : Added a StoreFileScanner to outstanding HStoreScanner
> 2008-12-21 12:47:31,741 FATAL org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay
of hlog required. Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region: urls,http|playvideogame.net|,1229725620550
>         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:228)
>         at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushSomeRegions(MemcacheFlusher.java:292)
>         at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.reclaimMemcacheMemory(MemcacheFlusher.java:262)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdates(HRegionServer.java:1594)
>         at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:632)
>         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> Caused by: java.util.ConcurrentModificationException
>         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
>         at java.util.HashMap$KeyIterator.next(HashMap.java:828)
>         at org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:736)
>         at org.apache.hadoop.hbase.regionserver.HStore.updateReaders(HStore.java:724)
>         at org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:693)
>         at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:629)
>         at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:865)
>         ... 10 more

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