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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9184) Ignore zk assign event if region is not known in transition
Date Mon, 12 Aug 2013 21:53:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737408#comment-13737408
] 

stack commented on HBASE-9184:
------------------------------

+1

Nice test.

In future, if editing log lines, try and make them more terse (we don't need 'server' in these
log lines for instance because what else would it be that would be writing these logs?)

Yours, St.Ack on his one man mission to make it so you don't need the scoreboard at att park
to see a full hbase log line!
                
> Ignore zk assign event if region is not known in transition
> -----------------------------------------------------------
>
>                 Key: HBASE-9184
>                 URL: https://issues.apache.org/jira/browse/HBASE-9184
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 0.98.0, 0.95.2
>
>         Attachments: trunk-9184.patch
>
>
> This is a follow up of HBASE-9161.  Currently, if a region is in transition, we ignore
any unexpected zk assign event and log a warning. For example, a zk closing event will be
ignored if the region is pending open actually.  However, if the region is not in transition,
we will accept such events.  For events not related to split/merge, we should ignore them
and log a warning too, to tighten up the region state transition.  During normal operation,
this (ensuring region is in transition before accepting transition related events) is fine.
 During master failover, this is fine as long as we don't do region transition bypass ZK.
 We should also make sure to watch assignment znodes after user region states are recovered,
so that we don't log many such warnings.

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