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https://issues.apache.org/jira/browse/HBASE-1442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-1442.
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> Large number of regions slows down start and stop of HBase clusters
> -------------------------------------------------------------------
>
> Key: HBASE-1442
> URL: https://issues.apache.org/jira/browse/HBASE-1442
> Project: HBase
> Issue Type: Improvement
> Reporter: Lars George
> Priority: Major
>
> A cluster with tables that have thousands of regions will take a long time to
> start and shut down.
> During the start the META table is scanned which takes a long time. Also at
> least minor compaction are performed that add to the delay as by default
> there is a 20sec wait time between the each compaction.
> Also region assignment may be not right assigning 10 regions at a time while
> unbalancing the servers.
> Shutting a large cluster down also takes a long time before everything is
> persisted and shut down orderly. Times in excess of 10 minutes have been
> noted. It needs to be investigated where this time is spent.
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