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From "Tom Beerbower (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-2158) Certain queries with metrics takes a long time (3 minutes on a 450-node cluster)
Date Fri, 17 May 2013 13:51:16 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660729#comment-13660729
] 

Tom Beerbower commented on AMBARI-2158:
---------------------------------------

In a large cluster we could have hundreds or thousands of resources to populate in the JMX
property provider for a single request.  The JMX source for each resource is potentially a
different host in the cluster which means hundreds or thousands of requests for JMX metrics.
 Rather than populating the resources serially, we should distribute the work across multiple
threads.
                
> Certain queries with metrics takes a long time (3 minutes on a 450-node cluster)
> --------------------------------------------------------------------------------
>
>                 Key: AMBARI-2158
>                 URL: https://issues.apache.org/jira/browse/AMBARI-2158
>             Project: Ambari
>          Issue Type: Bug
>            Reporter: Tom Beerbower
>            Assignee: Tom Beerbower
>
> On a 450-node cluster, the following query takes 3 minutes to respond:
> * /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
> The following query (only one metric) took 2.7 minutes:
> * /services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles,components/host_components/metrics/jvm/memHeapUsedM
> Note that the same query without the metrics only takes about 4 seconds:
> * /services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles

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