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https://issues.apache.org/jira/browse/HBASE-20000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364975#comment-16364975
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Duo Zhang commented on HBASE-20000:
-----------------------------------

{noformat}
"Any exclusive lock held by a parent proc P will not block it's child procedure 
trying to get the same lock"
{noformat}

When implementing HBASE-19397 I found that this is not trivial... Usually the 
parent procedure will release the lock after switching out so anyone can 
acquire the lock again... We have a holdLock method for Procedure which can 
control whether to always hold the lock even if you are not running at the 
time...

Pretty complicated...

> Remove the quantum logic in FairQueue, always put high priority queue in front
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-20000
>                 URL: https://issues.apache.org/jira/browse/HBASE-20000
>             Project: HBase
>          Issue Type: Sub-task
>          Components: proc-v2
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Major
>             Fix For: 2.0.0-beta-2
>
>         Attachments: HBASE-20000.patch
>
>




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