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