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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4497) If region opening fails after updating META HBCK reports it as inconsistent and scanning the region throws NSRE
Date Thu, 29 Sep 2011 21:09:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117617#comment-13117617
] 

jiraposter@reviews.apache.org commented on HBASE-4497:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/2118/
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Review request for hbase.


Summary
-------

Adds a checkAndPut that takes a timestamp


This addresses bug hbase-4497.
    https://issues.apache.org/jira/browse/hbase-4497


Diffs
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  src/main/java/org/apache/hadoop/hbase/ipc/HRegionInterface.java 3679c02 
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 7cbdb98 
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 0c06f4f 
  src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java 99b34cc 

Diff: https://reviews.apache.org/r/2118/diff


Testing
-------


Thanks,

Michael


                
> If region opening fails after updating META HBCK reports it as inconsistent and scanning
the region throws NSRE
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4497
>                 URL: https://issues.apache.org/jira/browse/HBASE-4497
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Priority: Critical
>
> As per the discussion in the mail chain "HBCK reporting of possible mismatch in RS assignment"
this JIRA is created.
> Consider two RS-> RS1 and RS2.
> A region tries to open in RS1. But it takes a while.  The RS1 has still not updated meta
and transitioned the node from OPENING to OPENED
> So timeout assigns the region to RS2.  RS2 successfully updates the META and opens the
region.
> Now RS1 tries to act on the region by first updating the META and then transiting the
node to OPENING to OPENED.
> RS1 transiting the node to OPENING to OPENED will fail.  But the META entry will have
RS1 as the latest.
> Now HBCK reports this as an inconsistency and if we try to scan the Region we get NotServingRegionException.

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