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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9696) Master recovery ignores online merge znode
Date Fri, 11 Oct 2013 17:24:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792832#comment-13792832
] 

Jimmy Xiang commented on HBASE-9696:
------------------------------------

Currently, for merging znode, we have the new region encoded name (from the znode path), but
we don't have its HRegionInfo.  Region states map need the HRegionInfo.  For splitting znode,
we don't have anything about the daughter regions (name or HRI). This patch passes all these
info over to master so the master can properly record these regions before the split/merge
starts.

> 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: 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.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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