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From "Lei Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13965) Stochastic Load Balancer JMX Metrics
Date Sun, 12 Jul 2015 22:27:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14624048#comment-14624048
] 

Lei Chen commented on HBASE-13965:
----------------------------------

Thanks for pointing it out.

I had some test and found that there are two system tables, hbase:meta and hbase:namespace.
The first one, hbase:meta, will not be given to balancer while hbase:namespace will.

Maybe I can just get the number of all tables, and -1 for removing hbase:meta? That will avoid
the looping.
{code}tablesCount = services.getTableDescriptors().getAll().size();
// -1 for removing a system table, hbase:meta, which will not be balanced.
tablesCount--;
{code}

However, this is based on an assumption that only one non-balancing system table exists. Is
there any better solution?

> 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-v7.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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