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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 edited comment on HBASE-20000 at 2/14/18 11:52 PM:
-------------------------------------------------------------
{quote}
"Any exclusive lock held by a parent proc P will not block it's child procedure
trying to get the same lock"
{quote}
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...
was (Author: apache9):
{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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