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Date: Wed, 25 Jan 2017 21:53:26 +0000 (UTC)
From: "Tim Brown (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.13037134.1485196921000.205329.1485381206684@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-17515) Reduce memory footprint of
 RegionLoads kept by StochasticLoadBalancer
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archived-at: Wed, 25 Jan 2017 21:53:33 -0000


    [ https://issues.apache.org/jira/browse/HBASE-17515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15838653#comment-15838653 ] 

Tim Brown commented on HBASE-17515:
-----------------------------------

The change to the test was required since 'stores' is not one of the values kept in the BalancerRegionLoad.java.

> Reduce memory footprint of RegionLoads kept by StochasticLoadBalancer
> ---------------------------------------------------------------------
>
>                 Key: HBASE-17515
>                 URL: https://issues.apache.org/jira/browse/HBASE-17515
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Tim Brown
>         Attachments: 17515.v1.txt
>
>
> Currently StochasticLoadBalancer uses the following fields of RegionLoad :
> {code}
>       return rl.getReadRequestsCount();
>       return rl.getWriteRequestsCount();
>       return rl.getMemStoreSizeMB();
>       return rl.getStorefileSizeMB();
> {code}
> However, RegionLoad refers to ClusterStatusProtos.RegionLoad which has 18 fields.
> This means we keep hbase.master.balancer.stochastic.numRegionLoadsToRemember (default value 15) RegionLoad's in memory but only use a small portion of them.
> This JIRA is to consider creating POJO which wraps the above 4 fields so that the memory footprint can be lowered.


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