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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1583) Start/Stop of large cluster untenable
Date Thu, 25 Jun 2009 22:32:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724327#action_12724327
] 

Jonathan Gray commented on HBASE-1583:
--------------------------------------

I like your idea, ryan.  Next generation of balancing needs to take into account actual usage
that comprises a complex notion of "load" including memcache, er memstore, usage, block cache
usage, and as you say, an additional factor could be how many other regions from the same
table are already assigned to that regionserver.

> 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
>             Fix For: 0.20.0
>
>
> 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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