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Date: Wed, 24 May 2017 17:32:04 +0000 (UTC)
From: "Brahma Reddy Battula (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HADOOP-14166) Reset the DecayRpcScheduler
 AvgResponseTime metric to zero when queue is not used
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archived-at: Wed, 24 May 2017 17:32:10 -0000


     [ https://issues.apache.org/jira/browse/HADOOP-14166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brahma Reddy Battula updated HADOOP-14166:
------------------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 2.8.2
                   3.0.0-alpha3
                   2.9.0
           Status: Resolved  (was: Patch Available)

Committed to {{trunk}},{{branch-2}} and {{branch-2.8}}. [~surendrasingh] thanks for your contribution. it's nice finding.. [~xyao] thanks for additional review.

> Reset the DecayRpcScheduler AvgResponseTime metric to zero when queue is not used
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-14166
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14166
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: common
>            Reporter: Surendra Singh Lilhore
>            Assignee: Surendra Singh Lilhore
>             Fix For: 2.9.0, 3.0.0-alpha3, 2.8.2
>
>         Attachments: HADOOP-14166.001.patch
>
>
> {noformat}
>  "name" : "Hadoop:service=NameNode,name=DecayRpcSchedulerMetrics2.ipc.8020",
>     "modelerType" : "DecayRpcSchedulerMetrics2.ipc.8020",
>     "tag.Context" : "ipc.8020",
>     "tag.Hostname" : "host1",
>     "DecayedCallVolume" : 3,
>     "UniqueCallers" : 1,
>     "Caller(root).Volume" : 266,
>     "Caller(root).Priority" : 3,
>     "Priority.0.AvgResponseTime" : 6.151201023385511E-5,
>     "Priority.1.AvgResponseTime" : 0.0,
>     "Priority.2.AvgResponseTime" : 0.0,
>     "Priority.3.AvgResponseTime" : 1.184686336544601,
>     "Priority.0.CompletedCallVolume" : 0,
>     "Priority.1.CompletedCallVolume" : 0,
>     "Priority.2.CompletedCallVolume" : 0,
>     "Priority.3.CompletedCallVolume" : 2,
>     "CallVolume" : 266
> {noformat}
> "Priority.0.AvgResponseTime" is always "6.151201023385511E-5" even the queue is not used for long time.
> {code}
>       if (lastAvg > PRECISION || averageResponseTime > PRECISION) {
>         if (enableDecay) {
>           final double decayed = decayFactor * lastAvg + averageResponseTime;
>           LOG.info("Decayed "  + i + " time " +   decayed);
>           responseTimeAvgInLastWindow.set(i, decayed);
>         } else {
>           responseTimeAvgInLastWindow.set(i, averageResponseTime);
>         }
>       }
> {code}
> we should reset it to zero when above condition is false.


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