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