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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9696) Master recovery ignores online merge znode
Date Thu, 03 Oct 2013 17:27:43 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jimmy Xiang updated HBASE-9696:
-------------------------------

    Attachment: trunk-9696.patch

Attached a patch that contains the following changes:

1. introduced two new states for region to be created at merging/splitting.  don't have good
names for them.
2. changed the payload of RegionTransition for merging/splitting, so that the new region info
is also passed to master when the process started. Therefore, we can simplify the processing
of these events, and make sure the new region can't be moved after the process is done, so
that they can be closed properly when moving.
3. handled merging region at master recovery properly.
4. added test for 3.
5. some code consolidation with Split/MergeRegionHandler


> 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
>         Attachments: trunk-9696.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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