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https://issues.apache.org/jira/browse/HBASE-4308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096190#comment-13096190
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Todd Lipcon commented on HBASE-4308:
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I was chatting with JD a bit about this class of bugs, yesterday.
In my opinion we should never modify the regionsInTransition map except in
response to hearing something from ZK. That is to say, handling REGION_OPENED,
we should just call delete on the ZK node. Then, when ZK tells us that the node
was deleted, we remove from RIT. RIT should be entirely "reactive" to ZK.
> Race between RegionOpenedHandler and AssignmentManager
> ------------------------------------------------------
>
> Key: HBASE-4308
> URL: https://issues.apache.org/jira/browse/HBASE-4308
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Fix For: 0.92.0
>
>
> When the master is processing a ZK event for REGION_OPENED, it calls delete()
> on the znode before it removes the node from RegionsInTransition. If the
> notification of that delete comes back into AssignmentManager before the
> region is removed from RIT, you see an error like:
> 2011-08-30 17:43:29,537 WARN [main-EventThread]
> master.AssignmentManager(861): Node deleted but still in RIT:
> .META.,,1.1028785192 state=OPEN, ts=1314751409532,
> server=todd-w510,55655,1314751396840
> Not certain if it causes issues, but it's a concerning log message.
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