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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9696) Master recovery ignores online merge znode
Date Fri, 11 Oct 2013 04:17:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792322#comment-13792322
] 

stack commented on HBASE-9696:
------------------------------

Just to report that this last patch of Jimmy's made it all the ways through the BLL test only
to fail on last verify but the next verify passed so no dataloss.  New test is running right
now.

> 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.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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