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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5959) Add other load balancers
Date Wed, 16 May 2012 18:01:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276942#comment-13276942
] 

Phabricator commented on HBASE-5959:
------------------------------------

eclark has commented on the revision "HBASE-5959 [jira] Add other load balancers".

  I'll get the config storing in the next version

INLINE COMMENTS
  src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java:241 There
are already config paramaters with balancer.<configName>  we should keep the hierarchy.
  src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java:256 And
I actually think it should be given a lower weight as the table cost is something that represents
an on going cost to the cluster and the locality cost is a one time transfer.  The impetus
for doing this work was that we saw production clusters that were no balancing because the
old balancer did not want to move regions around to balance the number of regions per table
(Something I've seen on several different production clusters now; a real issue on anything
that has big batch jobs).  Placing locality's weight above table cost would just mean that
the same thing could happen.

  However I think the middle ground combined with the ability to change  per install is enough
without testing on production clusters.
  src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java:251 Nope
I'll add that in my next version.

REVISION DETAIL
  https://reviews.facebook.net/D3189

To: JIRA, eclark
Cc: tedyu

                
> Add other load balancers
> ------------------------
>
>                 Key: HBASE-5959
>                 URL: https://issues.apache.org/jira/browse/HBASE-5959
>             Project: HBase
>          Issue Type: New Feature
>          Components: master
>    Affects Versions: 0.96.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>         Attachments: HBASE-5959-0.patch, HBASE-5959-1.patch, HBASE-5959-2.patch, HBASE-5959-3.patch,
HBASE-5959-6.patch, HBASE-5959-7.patch, HBASE-5959.D3189.1.patch, HBASE-5959.D3189.2.patch,
HBASE-5959.D3189.3.patch, HBASE-5959.D3189.4.patch
>
>
> Now that balancers are pluggable we should give some options.b

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