Duo Zhang commented on HBASE-19976:

I think yield is not a easy way for the developers, the retry is in the HTable 

And as I said above, the ServerCrashProcedure which carries meta should be high 
priority and it is in the server queue, the RecoverMeta should also be high 
priority but it is in the table 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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