stack commented on HBASE-19976:

Ideally we'd schedule RecoverMetaProcedure at the front of the queue.

> 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
>            Assignee: stack
>            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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