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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13965) Stochastic Load Balancer JMX Metrics
Date Fri, 10 Jul 2015 17:31:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14622624#comment-14622624
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stack commented on HBASE-13965:
-------------------------------

If a table is being balanced by the balancer, I would think an operator would want to know
metrics on why.

A blank table name given table is not a dimension when in ensemble mode would be reasonable
-- I'd remove the '_' prefix though... in fact, so we don't surprise operators, what about
flipping the metric name so it is Overall_Table1 rather than Table1_Overall. If we start with
Overall, operator will know where to look for this metric in the list... if table prefix,
could be anywhere in the list?



> 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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