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From "ramkrishna.s.vasudevan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5179) Concurrent processing of processFaileOver and ServerShutdownHandler may cause region is assigned before completing split log, it would cause data loss
Date Wed, 11 Jan 2012 16:40:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13184181#comment-13184181
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ramkrishna.s.vasudevan commented on HBASE-5179:
-----------------------------------------------

@Chunhui
Can you take a look at HBAE-4748.  It is similar to this but there the data loss was w.r.t
META leading to more critical data loss.  But it is quite rare but still possible.  Do you
have any suggestions for that?
                
> Concurrent processing of processFaileOver and ServerShutdownHandler  may cause region
is assigned before completing split log, it would cause data loss
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-5179
>                 URL: https://issues.apache.org/jira/browse/HBASE-5179
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.90.2
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: hbase-5179.patch
>
>
> If master's processing its failover and ServerShutdownHandler's processing happen concurrently,
it may appear following  case.
> 1.master completed splitLogAfterStartup()
> 2.RegionserverA restarts, and ServerShutdownHandler is processing.
> 3.master starts to rebuildUserRegions, and RegionserverA is considered as dead server.
> 4.master starts to assign regions of RegionserverA because it is a dead server by step3.
> However, when doing step4(assigning region), ServerShutdownHandler may be doing split
log, Therefore, it may cause data loss.

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