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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4880) Region is on service before openRegionHandler completes, may cause data loss
Date Wed, 07 Dec 2011 22:18:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164773#comment-13164773
] 

Hadoop QA commented on HBASE-4880:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12506518/4880.txt
  against trunk revision .

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

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated -160 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 72 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/466//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/466//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/466//console

This message is automatically generated.
                
> Region is on service before openRegionHandler completes, may cause data loss
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-4880
>                 URL: https://issues.apache.org/jira/browse/HBASE-4880
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.0, 0.94.0
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: 4880.txt, hbase-4880.patch, hbase-4880v2.patch, hbase-4880v3.patch
>
>
> OpenRegionHandler in regionserver is processed as the following steps:
> {code}
> 1.openregion()(Through it, closed = false, closing = false)
> 2.addToOnlineRegions(region)
> 3.update .meta. table 
> 4.update ZK's node state to RS_ZK_REGION_OPEND
> {code}
> We can find that region is on service before Step 4.
> It means client could put data to this region after step 3.
> What will happen if step 4 is failed processing?
> It will execute OpenRegionHandler#cleanupFailedOpen which will do closing region, and
master assign this region to another regionserver.
> If closing region is failed, the data which is put between step 3 and step 4 may loss,
because the region has been opend on another regionserver and be put new data. Therefore,
it may not be recoverd through replayRecoveredEdit() because the edit's LogSeqId is smaller
than current region SeqId.

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