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https://issues.apache.org/jira/browse/HBASE-19976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16360984#comment-16360984
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stack commented on HBASE-19976:
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bq. We need to introduce something like priority, and expose a method in
ProcedureScheduler to poll high priority procedure only.
Let me take a look.
bq. IMHO, the procedure framework is really over design...
Yeah, it gets a good bit of criticism. Was taken to a particular state and then
not looked at again. It is as yet unfinished, synchronous when the idea was
that it would run async, etc. I could start a doc. to accumulate wants and
comments.
> 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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