[jira] [Commented] (AMBARI-3017) UI's service call latency increases by a factor of 2 or 3 every 20-30 calls.

["Yusaku Sako (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13748883#comment-13748883 ] 

Yusaku Sako commented on AMBARI-3017:
-------------------------------------

[~srimanth.gunturi], is this from a single web UI client?
Does each data point represent the same API call in the description being made?
I'm trying to match it with the time tick below, which is spaced 6 seconds apart, and I see a whole bunch of data points in between each 6-second interval.  I know we don't poll this often, so I'm not sure how to read this graph.
                
> 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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