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https://issues.apache.org/jira/browse/HBASE-3019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-3019:
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Attachment: bulk-v4.txt
Patch that adds a bulk open region to the regionserver and that then has the
assignment manager do bulk operations per server.
Currently, this patch does not make assignments faster than what we currently
have. Talking about 3 minutes to assign 2k regions across 9 servers currenlty
vs 4 to 5 minutes for this patch.
Patch has concurrency issue and will play some more with it but seems like zk
is bottleneck -- all the state changes that happen for a region assignment.
> Make bulk assignment on cluster startup run faster
> --------------------------------------------------
>
> Key: HBASE-3019
> URL: https://issues.apache.org/jira/browse/HBASE-3019
> Project: HBase
> Issue Type: Improvement
> Reporter: stack
> Attachments: bulk-v4.txt
>
>
> Currently, as of HBASE-3018, we come up with a bulk assignment plan that is
> sorted by server. We then spawn a thread to assign out the regions per
> server so we are assigning in parallel. This works but is still slow enough
> (It looks to be slower than the old assignment where we'd do lumps of N
> regions at a time). We should be able to pass a regionserver all the regions
> to open in one RPC. We need to figure how to keep up zk state while
> regionserver is processing a big lot of regions. This looks a little awkward
> to do since currently open handler just opens region -- there is no notion of
> doing a ping while waiting to run.
> Being able to start the cluster fast is important for those times we take it
> down to do major upgrade; the longer it takes to spin up, the longer our
> 'downtime'.
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