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From "Steven Yates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8905) Add metrics for HTTP Server
Date Wed, 08 May 2013 12:25:17 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13651834#comment-13651834
] 

Steven Yates commented on HADOOP-8905:
--------------------------------------

Reviewing this improvement in more detail.

1) Will require org.mortbay.jetty:jmx-management dependency
2) Reviewing the out of the box statistics handler *-mbean properties I can see the following
are given;

StatisticsHandler: Request Statistics gathering
statsOnMs: Time in milliseconds stats have been collected for. 
statsReset(): Reset statistics.
requests: Number of requests since statsReset() called. 
requestsActive: Number of requests currently active. 
requestsActiveMin: Minimum number of active requests since statsReset() called. 
requestsActiveMax: Maximum number of active requests since statsReset() called. 
requestsDurationAve: Average duration of request handling in milliseconds  since statsReset()
called. 
requestsDurationMin: Get minimum duration in milliseconds of request handling since statsReset()
called. 
requestsDurationMax: Get maximum duration in milliseconds of request handling since statsReset()
called. 
requestsDurationTotal: Get total duration in milliseconds of all request handling since statsReset()
called. 

 
                
> Add metrics for HTTP Server
> ---------------------------
>
>                 Key: HADOOP-8905
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8905
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: metrics
>    Affects Versions: 3.0.0
>            Reporter: Todd Lipcon
>              Labels: newbie
>
> Currently we don't expose any metrics about the HTTP server. It would be useful to be
able to monitor the following:
> - Number of threads currently actively serving servlet requests
> - Total number of requests served
> - Perhaps break down time/count by endpoint (eg /jmx, /conf, various JSPs)
> This becomes more important as http-based protocols like webhdfs become more common

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