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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17786) Create LoadBalancer perf-tests (test balancer algorithm decoupled from workload)
Date Thu, 04 May 2017 20:29:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15997390#comment-15997390
] 

Sean Busbey commented on HBASE-17786:
-------------------------------------

{code}
+/**
+ * Tool to test performance of different {@link org.apache.hadoop.hbase.master.LoadBalancer}
+ * implementations.
+ */
+public class LoadBalancerPerformanceEvaluation extends AbstractHBaseTool {
{code}

Class description should include an example of how we expect folks to invoke this.

> Create LoadBalancer perf-tests (test balancer algorithm decoupled from workload)
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-17786
>                 URL: https://issues.apache.org/jira/browse/HBASE-17786
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Balancer, proc-v2
>            Reporter: stack
>            Assignee: Umesh Agashe
>              Labels: beginner
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17786.001.patch
>
>
> (Below is a quote from [~mbertozzi] taken from an internal issue that I'm moving out
here)
> Add perf tools and keep monitored balancer performance (a BalancerPE-type thing).
> Most of the balancers should be instantiable without requiring a mini-cluster, and it
easy to create tons of RegionInfo and ServerNames with a for loop.
> The balancer is just creating a map RegionInfo:ServerName.
> There are two methods to test roundRobinAssignment() and retainAssignment()
> {code}
> Map<ServerName, List<HRegionInfo>> roundRobinAssignment(
>     List<HRegionInfo> regions,
>     List<ServerName> servers
>   ) throws HBaseIOException; 
> Map<ServerName, List<HRegionInfo>> retainAssignment(
>     Map<HRegionInfo, ServerName> regions,
>     List<ServerName> servers
>   ) throws HBaseIOException;
> {code}
> There are a bunch of obvious optimization that everyone can see just by looking at the
code. (like replacing array with set when we do contains/remove operations). It will be nice
to have a baseline and start improving from there.



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