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https://issues.apache.org/jira/browse/HBASE-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732243#action_12732243
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stack commented on HBASE-1583:
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I took a look at this safe mode stuff. Its broken. Will open an issue. Whats
happening is that we exit safe mode near immediately after startup because
initial MetaScanner scan does nothing except set that initial scan has
completed (though it did nothing -- original idea was that initialScan would do
first scan of the newly deployed .META.). So, we exit safe mode near
immediately after startup.
Fixing metascanner so initial scan doesn't happen till we've scanned actual
deploy so safe mode stays in place while deploy is going on kills our
assignment rate. It crawls. I gave up trying to debug more since these above
patches undoing compactions on close and open seem to be enough to close this
issue at least for 0.20.0 release.
> Start/Stop of large cluster untenable
> -------------------------------------
>
> Key: HBASE-1583
> URL: https://issues.apache.org/jira/browse/HBASE-1583
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: stack
> Fix For: 0.20.0
>
> Attachments: 1583-nocompactonclose.patch,
> 1583-v2-nocompactonopenclose.patch
>
>
> Starting and stopping a loaded large cluster is way too flakey and takes too
> long. This is 0.19.x but same issues apply to TRUNK I'd say.
> At pset with our > 100 nodes carrying 6k regions:
> + shutdown takes way too long.... maybe ten minutes or so. We compact
> regions inline with shutdown. We should just go down. It doesn't seem like
> all regionservers go down everytime either.
> + startup is a mess with our assigning out regions an rebalancing at same
> time. By time that the compactions on open run, it can be near an hour
> before whole thing settles down and becomes useable
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