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https://issues.apache.org/jira/browse/HBASE-19533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16329522#comment-16329522
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stack edited comment on HBASE-19533 at 1/17/18 10:03 PM:
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Over in HBASE-19527, I set all ProcV2 threads to be daemon – they were not –
and I remove the above special casing that was added to
TestRegionsOnMasterOptions. This makes it so the likes of the Master will go
down more promptly. This is but an aspect of what this issue is about, whether
Master should run all shutdown/close of regions, even on cluster shutdown?
was (Author: stack):
Over in HBASE-19527, I set all ProcV2 threads to be daemon – they were not –
and I remove the above special casing that was added to
TestRegionsOnMasterOptions.
> How to do controlled shutdown in branch-2?
> ------------------------------------------
>
> Key: HBASE-19533
> URL: https://issues.apache.org/jira/browse/HBASE-19533
> Project: HBase
> Issue Type: Task
> Reporter: stack
> Priority: Critical
> Fix For: 2.0.0-beta-2
>
>
> Before HBASE-18946, setting shutdown of a cluster, the Master would exit
> immediately. RegionServers would run region closes and then try and notify
> the Master of the close and would spew exceptions that the Master was
> unreachable.
> This is different to how branch-1 used to do it. It used to keep Master up
> and it would be like the captain of the ship, the last to go down. As of
> HBASE-18946, this is again the case but there are still open issues.
> # Usually Master does all open and close of regions. On cluster shutdown, it
> is the one time where the Regions run the region close. Currently, the
> regions report the close to the Master which disregards the message since it
> did not start the region closes. Should we do different? Try and update state
> in hbase:meta setting it to CLOSE? We might not be able to write CLOSE for
> all regions since hbase:meta will be closing too (the RS that is hosting
> hbase:meta will close it last.... but that may not be enough).
> # Should the Master run the cluster shutdown sending out close for all
> regions? What if cluster of 1M regions? Untenable? Send a message per server?
> That might be better.
> Anyways, this needs attention. Filing issue in meantime.
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