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https://issues.apache.org/jira/browse/HBASE-20847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537074#comment-16537074
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stack commented on HBASE-20847:
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What of the case where the parent procedure takes an exclusive lock for the
life of the Procedure? The sub-procedure might put in place an exclusive lock
while it runs but it won't restore the parent procedures' lifetime lock. Is
this an argument that parent procedure should run before sub-procedures to at
least restore any locks it had taken (shared or exclusve, lifetime or
step-duration).
> The parent procedure of RegionTransitionProcedure may not have the table lock
> -----------------------------------------------------------------------------
>
> Key: HBASE-20847
> URL: https://issues.apache.org/jira/browse/HBASE-20847
> Project: HBase
> Issue Type: Sub-task
> Components: proc-v2, Region Assignment
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Major
> Attachments: HBASE-20847-v1.patch, HBASE-20847.patch
>
>
> For example, SCP can also schedule AssignProcedure and obviously it will not
> hold the table lock.
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