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From "Srimanth Gunturi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-3017) UI's service call latency increases by a factor of 2 or 3 every 20-30 calls.
Date Fri, 23 Aug 2013 20:05:51 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13748946#comment-13748946
] 

Srimanth Gunturi commented on AMBARI-3017:
------------------------------------------

[~u39kun], the data was not collected from in-browser invocations. This was in a thread calling
the API 500 times repeatedly. Also, the markers in graph do no represent an API invocation.
Its a 500ms sampling interval of the invocation times. But the line does represent the time
the client takes.
                
> UI's service call latency increases by a factor of 2 or 3 every 20-30 calls.
> ----------------------------------------------------------------------------
>
>                 Key: AMBARI-3017
>                 URL: https://issues.apache.org/jira/browse/AMBARI-3017
>             Project: Ambari
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 1.4.0
>            Reporter: Srimanth Gunturi
>            Assignee: Mahadev konar
>              Labels: performance
>             Fix For: 1.4.0
>
>         Attachments: servicesGC.png
>
>
> Every 20-30 calls for service metrics, latency of the next 5 calls are a multiple of
2 or 3. This might be due to garbage collection. But basically in UI, the updates seem to
take longer. 
> The call UI makes is
> {noformat}
> /api/v1/clusters/${cluster}/services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles,components/host_components/metrics/jvm/memHeapUsedM,components/host_components/metrics/jvm/memHeapCommittedM,components/host_components/metrics/mapred/jobtracker/trackers_decommissioned,components/host_components/metrics/cpu/cpu_wio,components/host_components/metrics/rpc/RpcQueueTime_avg_time,components/host_components/metrics/flume/flume,components/host_components/metrics/yarn/Queue
> {noformat}

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