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https://issues.apache.org/jira/browse/HBASE-4695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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gaojinchao updated HBASE-4695:
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Attachment: HBASE-4695_branch90_trial.patch
Go back to company and verify this patch.
If you are free, Please review it firstly.
The patch seems simple.
> WAL logs get deleted before region server can fully flush
> ---------------------------------------------------------
>
> Key: HBASE-4695
> URL: https://issues.apache.org/jira/browse/HBASE-4695
> Project: HBase
> Issue Type: Bug
> Components: wal
> Affects Versions: 0.90.4
> Reporter: jack levin
> Assignee: gaojinchao
> Priority: Blocker
> Fix For: 0.90.5
>
> Attachments: HBASE-4695_branch90_trial.patch
>
>
> To replicate the problem do the following:
> 1. check /hbase/.logs/XXXX directory to see if you have WAL logs for the
> region server you are shutting down.
> 2. executing kill <pid> (where pid is a regionserver pid)
> 3. Watch the regionserver log to start flushing, you will see how many
> regions are left to flush:
> 09:36:54,665 INFO org.apache.hadoop.hbase.regionserver.HRegionServer: Waiting
> on 489 regions to close
> 09:56:35,779 INFO org.apache.hadoop.hbase.regionserver.HRegionServer: Waiting
> on 116 regions to close
> 4. Check /hbase/.logs/XXXX -- you will notice that it has dissapeared.
> 5. Check namenode logs:
> 09:26:41,607 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit:
> ugi=root ip=/10.101.1.5 cmd=delete
> src=/hbase/.logs/rdaa5.prod.imageshack.com,60020,1319749
> Note that, if you kill -9 the RS now, and it crashes on flush, you won't have
> any WAL logs to replay. We need to make sure that logs are deleted or moved
> out only when RS has fully flushed. Otherwise its possible to lose data.
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