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https://issues.apache.org/jira/browse/HADOOP-8905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472566#comment-13472566
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Aaron T. Myers commented on HADOOP-8905:
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Might also be nice to use the percentile metrics support to record high
percentile response times.
> 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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