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From "Zhihong Yu (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5179) Concurrent processing of processFaileOver and ServerShutdownHandler may cause region to be assigned before log splitting is completed, causing data loss
Date Thu, 12 Jan 2012 17:17:40 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhihong Yu updated HBASE-5179:
------------------------------

    Hadoop Flags: Reviewed
         Summary: Concurrent processing of processFaileOver and ServerShutdownHandler may
cause region to be assigned before log splitting is completed, causing data loss  (was: Concurrent
processing of processFaileOver and ServerShutdownHandler  may cause region is assigned before
completing split log, it would cause data loss)
    
> Concurrent processing of processFaileOver and ServerShutdownHandler may cause region
to be assigned before log splitting is completed, causing 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: 5179-90.txt, 5179-90v2.patch, 5179-90v3.patch, 5179-v2.txt, 5179-v3.txt,
5179-v4.txt, hbase-5179.patch, hbase-5179v5.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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