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From "Lei Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13965) Stochastic Load Balancer JMX Metrics
Date Fri, 10 Jul 2015 18:21:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14622705#comment-14622705
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Lei Chen commented on HBASE-13965:
----------------------------------

Ted, Clay, and stack, thanks for offering suggestions. 

Currently, in the ensemble mode, the combined table is named "ensemble", I somehow feel that
it might be a good idea to use the name directly. For example, "ensemble_Overall" or "ensemble_costFunction1".


In a similar way, when in the per-table mode, the system table hbase:namespace can be reported
to JMX using it's name directly as well. The benefit is that we can avoid any special case
handling in the balancer. The balancer just calculate and report whatever tables given by
hmaster. 

I'm updating the unit test to cover both modes. 


> Stochastic Load Balancer JMX Metrics
> ------------------------------------
>
>                 Key: HBASE-13965
>                 URL: https://issues.apache.org/jira/browse/HBASE-13965
>             Project: HBase
>          Issue Type: Improvement
>          Components: Balancer, metrics
>            Reporter: Lei Chen
>            Assignee: Lei Chen
>         Attachments: HBASE-13965-v3.patch, HBASE-13965-v4.patch, HBASE-13965-v5.patch,
HBASE-13965-v6.patch, HBASE-13965_v2.patch, HBase-13965-v1.patch, stochasticloadbalancerclasses_v2.png
>
>
> Today’s default HBase load balancer (the Stochastic load balancer) is cost function
based. The cost function weights are tunable but no visibility into those cost function results
is directly provided.
> A driving example is a cluster we have been tuning which has skewed rack size (one rack
has half the nodes of the other few racks). We are tuning the cluster for uniform response
time from all region servers with the ability to tolerate a rack failure. Balancing LocalityCost,
RegionReplicaRack Cost and RegionCountSkew Cost is difficult without a way to attribute each
cost function’s contribution to overall cost. 
> What this jira proposes is to provide visibility via JMX into each cost function of the
stochastic load balancer, as well as the overall cost of the balancing plan.



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