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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4203) While master restarts and if the META region's state is OPENING then master cannot assign META until timeout monitor deducts
Date Tue, 16 Aug 2011 09:40:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085610#comment-13085610
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ramkrishna.s.vasudevan commented on HBASE-4203:
-----------------------------------------------

In the above logs I had reduced the timeout monitor period to a lesser value.
Hence you can see that the META region assignment started in about 18mins

> While master restarts and if the META region's state is OPENING then master cannot assign
META until timeout monitor deducts
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4203
>                 URL: https://issues.apache.org/jira/browse/HBASE-4203
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>
> 1. Start Master and 2 RS.
> 2. If any exception happens while opening the META region the state in znode will be
OPENING.
> 3. If at this point the master restarts then the master will start processing the regions
in RIT.
> 4. If the znode is found to be in OPENING then master waits for timeout monitor to deduct
and then call opening.
> 5. If default timeout monitor is configured(1800000 sec/30 min) then it will take 30
mins to open the META region itself.
> Soln:
> ====
> Better not to wait for the Timeout monitor period to open catalog tables on Master restart

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