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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3390) Double-close makes for double-assign of a region
Date Wed, 22 Dec 2010 21:57:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-3390:
-------------------------

    Attachment: history_of_region_in_master.txt

Here is extract from Master.  I checked RS log and its doing nice clean close.

> Double-close makes for double-assign of a region
> ------------------------------------------------
>
>                 Key: HBASE-3390
>                 URL: https://issues.apache.org/jira/browse/HBASE-3390
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>         Attachments: history_of_region_in_master.txt
>
>
> I see double-assign during a rolling restart test.  Its happening when master joins existing
cluster... half the RSs have reported in but its taking on splits anyways (I have it splitting
and balancing continuously).  A split comes in immediately followed by a balance.  What I
think is happening is that the split comes in and clears a CLOSING from RIT as part of its
cleanup of parent region references.  This is messing up the run of balancers' close somehow;
we're getting node created and children changed zk events and this makes somehow for the double
closed.
> I'm enabling zk logging and will try harder to hunt this one down.
> Not creating as BLOCKER on 0.90.0 because I think its ok to disable balancer while rolling
restart is going on -- and the current rolling restart is a horror anyways doing its maximmal
region moving.

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