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https://issues.apache.org/jira/browse/HBASE-19976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16360473#comment-16360473
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Duo Zhang commented on HBASE-19976:
-----------------------------------

It is not easy to fix since the MasterProcedureScheduler is really really 
complicated...

> Dead lock if the worker threads in procedure executor are exhausted
> -------------------------------------------------------------------
>
>                 Key: HBASE-19976
>                 URL: https://issues.apache.org/jira/browse/HBASE-19976
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Duo Zhang
>            Priority: Critical
>
> See the comments in HBASE-19554. If all the worker threads are stuck in 
> AssignProcdure since meta region is offline, then the RecoverMetaProcedure 
> can not be executed and cause dead lock.



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