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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1583) Start/Stop of large cluster untenable
Date Thu, 25 Jun 2009 01:37:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723861#action_12723861
] 

Jim Kellerman commented on HBASE-1583:
--------------------------------------

@stack:

> 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

safe mode was to prevent rebalancing during startup. Are we not using safe mode anymore?

@ryan

> The master needs to blast region assignments out there in a threaded/performant manner

What I was planning to do for 0.21 when I put region assignments in ZK was to make a znode
whose children are unassigned regions. A region server can then decide if it is too busy or
not, and if not, remove the unassigned region from the list and add it to its list of regions
being
served once the region is available.

This removes the master from region assignment. It would then only need to detect unassigned
regions.

> 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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