[jira] [Commented] (AMBARI-3573) Configure Ganglia Web Server to use KeepAlive connections

["Dmitry Lysnichenko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801860#comment-13801860 ] 

Dmitry Lysnichenko commented on AMBARI-3573:
--------------------------------------------

+1

> Configure Ganglia Web Server to use KeepAlive connections
> ---------------------------------------------------------
>
>                 Key: AMBARI-3573
>                 URL: https://issues.apache.org/jira/browse/AMBARI-3573
>             Project: Ambari
>          Issue Type: Task
>          Components: agent
>    Affects Versions: 1.5.0
>            Reporter: Oleksandr Diachenko
>            Assignee: Oleksandr Diachenko
>             Fix For: 1.5.0
>
>         Attachments: AMBARI-3573.patch
>
>
> When performance profiling a 20 node cluster it was discovered that using KeepAlive http connections resulted in a 7% performance gain for a query that returned all host_component metrics.
> The GangliaPropertyProvider gets ganglia data by invoking the cgi script rrd.py.  This results in a new HttpUrlConnection and input stream being obtained for each request to the ganglia back end.  
> By default KeepAlive is enabled for Apache but we should ensure this is the case for the http server that provides rrd.py.
> For apache, this is configured in httpd.conf.  



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