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https://issues.apache.org/jira/browse/HBASE-3294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965825#action_12965825
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ryan rawson commented on HBASE-3294:
------------------------------------
It might be due to this code:
KeyValue kvReturn = this.current.next();
KeyValue kvNext = this.current.peek();
if (kvNext == null) {
this.current.close();
...
If a store scanner comes to the end of it's scan, it will automatically call
close() on itself. This will deregister the changed reader observer. Then the
heap will also call close() which will redo that operation.
Removing the 'this.current.close()' code isn't really possible because this
heap is used on both StoreScanner and StoreFileScanner, and we want the close()
semantics in there. The StoreFileScanner doesn't work in the same way as well.
We should just remove the message, don't even bother checking for existence
because it doesn't matter, the important part is we are no longer registered.
> WARN org.apache.hadoop.hbase.regionserver.Store: Not in set (double-remove?)
> org.apache.hadoop.hbase.regionserver.storescan...@76607d3d
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-3294
> URL: https://issues.apache.org/jira/browse/HBASE-3294
> Project: HBase
> Issue Type: Bug
> Reporter: stack
> Fix For: 0.90.0
>
>
> We see this ugly message in running hbase. Its a little disorientating. I
> added stack traces around the call to close. Here are the two I see (The
> WARN message is the bad one... the INFO is the good case). Looks like
> compaction is the one that triggers the WARN.
> {code}
> 2010-12-01 18:20:28,307 WARN org.apache.hadoop.hbase.regionserver.Store: Not
> in set (double-remove?)
> org.apache.hadoop.hbase.regionserver.storescan...@68faedc7
> java.io.IOException: WHY
> at
> org.apache.hadoop.hbase.regionserver.Store.deleteChangedReaderObserver(Store.java:583)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.close(StoreScanner.java:204)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:242)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:326)
> at org.apache.hadoop.hbase.regionserver.Store.compact(Store.java:939)
> at org.apache.hadoop.hbase.regionserver.Store.compact(Store.java:748)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.compactStores(HRegion.java:753)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.compactStores(HRegion.java:698)
> at
> org.apache.hadoop.hbase.regionserver.CompactSplitThread.run(CompactSplitThread.java:81)
> 2010-12-01 18:21:18,103 INFO org.apache.hadoop.hbase.regionserver.Store:
> CLOSE org.apache.hadoop.hbase.regionserver.storescan...@3dca256e
> java.io.IOException: WHY
> at
> org.apache.hadoop.hbase.regionserver.Store.deleteChangedReaderObserver(Store.java:592)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.close(StoreScanner.java:204)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.close(KeyValueHeap.java:192)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner.close(HRegion.java:2361)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:2945)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:2844)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:1566)
> at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:570)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1036)
> {code}
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