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Date: Fri, 23 Aug 2013 18:03:53 +0000 (UTC)
From: "Srimanth Gunturi (JIRA)" <jira@apache.org>
To: ambari-dev@incubator.apache.org
Message-ID: <JIRA.12665277.1377281001306.24268.1377281033758@arcas>
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Subject: [jira] [Created] (AMBARI-3013) Powering off RM node increases API
 latency by a factor of 6
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Srimanth Gunturi created AMBARI-3013:
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             Summary: 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
             Fix For: 1.4.0


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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