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Date: Tue, 27 Nov 2012 04:23:59 +0000 (UTC)
From: "Tom Beerbower (JIRA)" <jira@apache.org>
To: ambari-dev@incubator.apache.org
Message-ID: <1481905661.26098.1353990239769.JavaMail.jiratomcat@arcas>
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Subject: [jira] [Commented] (AMBARI-1037) Implement an efficient way to
 provide Ganglia data for heatmap and other cluster visualization tools
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    [ https://issues.apache.org/jira/browse/AMBARI-1037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504363#comment-13504363 ] 

Tom Beerbower commented on AMBARI-1037:
---------------------------------------

A request like ...
{code}
    clusters/c1/hosts?fields=metrics/cpu
{code}

will make a single request to get the cpu metrics for all of the hosts.  You can also specify multiple categories/metrics and temporal information.
                
> Implement an efficient way to provide Ganglia data for heatmap and other cluster visualization tools 
> -----------------------------------------------------------------------------------------------------
>
>                 Key: AMBARI-1037
>                 URL: https://issues.apache.org/jira/browse/AMBARI-1037
>             Project: Ambari
>          Issue Type: Sub-task
>            Reporter: Tom Beerbower
>            Assignee: Tom Beerbower
>         Attachments: AMBARI-1037.patch
>
>
> Rendering a cluster heatmap requires retrieving a metric (or a set of metrics) across all hosts in the cluster (current or any point-in-time in the past for which the data points are available).
> Currently Ganglia metrics a retrieved with one request per resource. This mechanism is not suited for cluster heatmap rendering purposes as it would require N calls to Ganglia Web where N is the number of hosts in the cluster. 

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