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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9525) "Move" region right after a region split is dangerous
Date Mon, 16 Sep 2013 20:48:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13768738#comment-13768738
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Jimmy Xiang commented on HBASE-9525:
------------------------------------

Checked the code. It is indeed an issue. Move uses a method balance.  Let me tighten it up.
                
> "Move" region right after a region split is dangerous
> -----------------------------------------------------
>
>                 Key: HBASE-9525
>                 URL: https://issues.apache.org/jira/browse/HBASE-9525
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Devaraj Das
>         Attachments: logs.txt
>
>
> I ran into a situation where the CM issued a move for a region just after a region was
split. The master went bonkers since the master honored the CM request, and assigned the split
region, but subsequently all the region state assumptions on this (split)region was messed
up. I started seeing log lines lines like "THIS SHOULD NOT HAPPEN". Also, it created other
problems - a compaction on original region happened on the new assignee, and then the daughter
regions started seeing issues to do with store files missing, etc., etc. 
> I will upload the logs shortly.

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