[jira] [Created] (AMBARI-3086) Services API call with metrics takes 30% longer with all services started

["Srimanth Gunturi (JIRA)" <ji...@apache.org>]

Srimanth Gunturi created AMBARI-3086:
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             Summary: Services API call with metrics takes 30% longer with all services started
                 Key: AMBARI-3086
                 URL: https://issues.apache.org/jira/browse/AMBARI-3086
             Project: Ambari
          Issue Type: Task
          Components: controller
    Affects Versions: 1.4.0
            Reporter: Srimanth Gunturi


I stopped all the services and started invoking the /services endpoint. While that was looping, I invoked the 'Start all services' call. The time being taken by the same call increased now by over 30%.

The exact /services call made was 
{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}

Time measurements in milliseconds:
{noformat}
/services	All Stopped	All Started
Total Time	2100.704545	2926.313725
Latency Time	2048.295455	2838.764706
Transfer Time	52.40909091	87.54901961
Data size (bytes)	825555	1371548
{noformat}

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