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https://issues.apache.org/jira/browse/HBASE-3621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005441#comment-13005441
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Ted Yu commented on HBASE-3621:
-------------------------------

unassign() has the following block which is before making RPC call:
{code}
    synchronized (regionsInTransition) {
    }
{code}
so we don't need to enclose unassign() in the synchronized block of chore().

> The timeout handler in AssignmentManager does an RPC while holding lock on 
> RIT; a big no-no
> -------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3621
>                 URL: https://issues.apache.org/jira/browse/HBASE-3621
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.90.2
>
>
> J-D found this debugging a failure on Dmitriy's cluster; we're RPC'ing under 
> a synchronized(regionsInTransition).  Fix.

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