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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13965) Stochastic Load Balancer JMX Metrics
Date Mon, 27 Jul 2015 22:42:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643544#comment-14643544
] 

Ted Yu commented on HBASE-13965:
--------------------------------

{code}
+   * This constructor that accepts an instance of MetricsBalancer,
+   * which will be used instead of creating a new one
{code}
'This constructor' -> 'Constructor'
{code}
+  protected BaseLoadBalancer(MetricsBalancer metricsBalancer) {
+    if (metricsBalancer != null)
+      this.metricsBalancer = metricsBalancer;
+    else
+      this.metricsBalancer = new MetricsBalancer();
{code}
Either put the assignment on the same line as if / else, or enclose assignment in curly braces.
{code}
+    } catch (Exception e) {
+      LOG.info("failed to get the size of all tables, exception = " + e.getMessage());
{code}
The above log should be at error level.



> 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-v8.patch, HBASE-13965-v9.patch, HBASE-13965_v2.patch,
HBase-13965-JConsole.png, 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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