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From "ramkrishna.s.vasudevan (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 Wed, 28 Sep 2011 14:49:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116524#comment-13116524
] 

ramkrishna.s.vasudevan commented on HBASE-4497:
-----------------------------------------------

As Ming suggested 
we can generate an incremental integer at the master side which will be generated per region
and pass that value over RPC which we can be checked before updating the META.

This value can be maintained in the master side in a map with region as the key.


                
> 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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