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From "gaojinchao (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4695) WAL logs get deleted before region server can fully flush
Date Mon, 31 Oct 2011 08:02:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139987#comment-13139987

gaojinchao commented on HBASE-4695:

I think your patch has some problem. when this.fsOk is false, we clean the Hlog, the data
will lose. 

> 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, hbase-4695-0.92.txt
> 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=/ 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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