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From "Mahadev konar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-3013) Powering off RM node increases API latency by a factor of 6
Date Wed, 04 Sep 2013 18:50:55 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-3013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758165#comment-13758165
] 

Mahadev konar commented on AMBARI-3013:
---------------------------------------

Tom,
 Isnt the connect timeout is mostly for establishing the connection? I am not sure if the
process is down, we should be getting connection refused immidiately. Now I think it might
not be the connection timeout that is causing the delay. Oleks does the timeout 
                
> Powering off RM node increases API latency by a factor of 6
> -----------------------------------------------------------
>
>                 Key: AMBARI-3013
>                 URL: https://issues.apache.org/jira/browse/AMBARI-3013
>             Project: Ambari
>          Issue Type: Bug
>          Components: controller
>    Affects Versions: 1.4.0
>            Reporter: Srimanth Gunturi
>            Assignee: Mahadev konar
>              Labels: perfomance
>             Fix For: 1.4.0
>
>         Attachments: Response Time Graph_conn_timeout1000.png, Response Time Graph_conn_timeout5000.png,
RMpaused.png
>
>
> On a 4 node cluster I was testing the below API call.
> {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}
> When everything was working the latency was ~500ms. 
> I then powered off the RM node, and immediately the call latency spiked by 30 times (~15000ms)
. After some time, it reduced, but still was 6 times the original latency (~3000ms). When
the machine came back online, the call again fell back to its original ~500ms latency.
> Images attached.

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