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https://issues.apache.org/jira/browse/HBASE-9810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-9810:
--------------------------
Status: Patch Available (was: Open)
> Global memstore size will be calculated wrongly if replaying recovered edits
> throws exception
> ---------------------------------------------------------------------------------------------
>
> Key: HBASE-9810
> URL: https://issues.apache.org/jira/browse/HBASE-9810
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.0, 0.96.1
> Reporter: chunhui shen
> Assignee: chunhui shen
> Priority: Critical
> Attachments: hbase-9810-trunk.patch
>
>
> Recently we encountered such a case in 0.94-version:
> Flush is triggered frequently because:
> {noformat}DEBUG org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Flush
> thread woke up because memory above low water=14.4g
> {noformat}
> But, the real global memstore size is about 1g.
> It seems the global memstore size has been calculated wrongly.
> Through the logs, I find the following root cause log:
> {noformat}
> ERROR org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler: Failed
> open of region=notifysub2_index,\x83\xDC^\xCD\xA3\x8A<\x
> E2\x8E\xE6\xAD!\xDC\xE8t\xED,1379148697072.46be7c2d71c555379278a7494df3015e.,
> starting to roll back the global memstore size.
> java.lang.NegativeArraySizeException
> at org.apache.hadoop.hbase.KeyValue.getFamily(KeyValue.java:1096)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:2933)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEditsIfAny(HRegion.java:2811)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:583)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:499)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3939)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3887)
> at
> org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:332)
> at
> org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:108)
> at
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> {noformat}
> Browse the code of this part, seems a critial bug about global memstore size
> when replaying recovered edits.
> (RegionServerAccounting#clearRegionReplayEditsSize is called for each edit
> file, it means the roll back size is smaller than actual when calling
> RegionServerAccounting#rollbackRegionReplayEditsSize)
> Anyway, the solution is easy as the patch.
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