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