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From "stack (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 18:58:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085900#comment-13085900
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stack commented on HBASE-4203:
------------------------------

Your explanation above helps a lot.  Now its clear what you are going on about.  So,  how
do you distingush between the case where a master comes on line and the RIT is OPENING but
NO exception has happened processing .META... its just a bit slow and will move to OPENED
in a little while... how you distinguish this case form the pathological case you describe
above where we have to wait 30 mins?

Otherwise, yes, this is important one to fix.  Good on you Ram.

> 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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