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From "Hadoop QA (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 Thu, 12 Jan 2012 05:23:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13184734#comment-13184734
] 

Hadoop QA commented on HBASE-5179:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12510311/5179-90v2.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/744//console

This message is automatically generated.
                
> 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: 5179-90.txt, 5179-90v2.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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