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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9696) Master recovery ignores online merge znode
Date Fri, 11 Oct 2013 21:10:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13793050#comment-13793050
] 

Jeffrey Zhong commented on HBASE-9696:
--------------------------------------

I read through the patch which seems ok to me(+1).  Since it's hard to cover all the variations
from the new states, I agree you that let's fix new issue if there're some overlooked factors.
Thanks.

> Master recovery ignores online merge znode
> ------------------------------------------
>
>                 Key: HBASE-9696
>                 URL: https://issues.apache.org/jira/browse/HBASE-9696
>             Project: HBase
>          Issue Type: Bug
>          Components: master, Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 0.98.0, 0.96.1
>
>         Attachments: 0.96-9696_v3.2.patch, 0.96-9696_v3.3.patch, trunk-9696.patch, trunk-9696_v2.1.patch,
trunk-9696_v2.patch, trunk-9696_v3.1.patch, trunk-9696_v3.2.patch, trunk-9696_v3.3.patch,
trunk-9696_v3.patch, trunk-9696_v3.patch
>
>
> The online merge znode uses the new region to be created.  When master restarts, the
new region is still unknown if the merging is not completed. Therefore the znode is ignored,
which should not.  That means the two merging regions could be moved around.  This could cause
some data loss if we are not luck.



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