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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9249) Add cp hook before setting PONR in split
Date Tue, 17 Sep 2013 03:19:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13769145#comment-13769145
] 

Anoop Sam John commented on HBASE-9249:
---------------------------------------

+1
                
> Add cp hook before setting PONR in split
> ----------------------------------------
>
>                 Key: HBASE-9249
>                 URL: https://issues.apache.org/jira/browse/HBASE-9249
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 0.98.0
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>             Fix For: 0.98.0
>
>         Attachments: HBASE-9249.patch, HBASE-9249_v2.patch, HBASE-9249_v3.patch, HBASE-9249_v4.patch,
HBASE-9249_v5.patch, HBASE-9249_v6.patch, HBASE-9249_v7.patch, HBASE-9249_v7.patch, HBASE-9249_v8.patch,
HBASE-9249_v8.patch
>
>
> This hook helps to perform split on user region and corresponding index region such that
both will be split or none.
> With this hook split for user and index region as follows
> user region
> ===========
> 1) Create splitting znode for user region split
> 2) Close parent user region
> 3) split user region storefiles
> 4) instantiate child regions of user region
> Through the new hook we can call index region transitions as below
> index region
> ===========
> 5) Create splitting znode for index region split
> 6) Close parent index region
> 7) Split storefiles of index region
> 8) instantiate child regions of the index region
> If any failures in 5,6,7,8 rollback the steps and return null, on null return throw exception
to rollback for 1,2,3,4
> 9) set PONR
> 10) do batch put of offline and split entries for user and index regions
> index region
> ============
> 11) open daughers of index regions and transition znode to split. This step we will do
through preSplitAfterPONR hook. Opening index regions before opening user regions helps to
avoid put failures if there is colocation mismatch(this can happen if user regions opening
completed but index regions opening in progress)
> user region
> ===========
> 12) open daughers of user regions and transition znode to split.
> Even if region server crashes also at the end both user and index regions will be split
or none

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