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https://issues.apache.org/jira/browse/HBASE-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716710#action_12716710
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stack commented on HBASE-1076:
------------------------------
This is not a CME. Its NPE.
Here is code:
{code}
328 MapFile.Reader [] readers = this.store.getReaders();
329 if (this.scanners[HSFS_INDEX] == null && readers != null &&
330 readers.length > 0) {
{code}
Its not the this.store because that is never cleared.
Its not the readers because stack variable and we just checked it not null.
This this.scanners is never cleared.
Can you see what it is?
> CME in HStore.notifyChangedReadersObservers
> -------------------------------------------
>
> Key: HBASE-1076
> URL: https://issues.apache.org/jira/browse/HBASE-1076
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.19.1
> Reporter: Andrew Purtell
> Assignee: stack
> Priority: Blocker
> Fix For: 0.19.4
>
>
> 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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