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https://issues.apache.org/jira/browse/S4-86?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592291#comment-13592291
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Daniel Gómez Ferro commented on S4-86:
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I found a couple of minor issues:
* In S4Metrics line 86, we have to remove the extra call 'matcher.find()'
* In ProcessingElement we are registering a per-PE timer (line 175) but we
are not using it, since the calls are commented out (lines 441-470)
> Metrics
> -------
>
> Key: S4-86
> URL: https://issues.apache.org/jira/browse/S4-86
> Project: Apache S4
> Issue Type: New Feature
> Affects Versions: 0.6
> Reporter: Matthieu Morel
> Fix For: 0.6
>
>
> Improving performance of S4 applications requires metrics that can be
> analyzed.
> Some metrics suggested in S4-65 are:
> * event rate
> * average/median event processing time
> * event queue sizes
> * number of PE instances
> * number of processed events ( maybe within a sliding window)
> * exceptions during event processing
> We'd also add things like:
> * shedding stats
> * memory usage
> * CPU load
> * checkpointing: effective checkpoints, rejected ones
> * etc...
> Ideally, we'd be able to have different kinds of metrics, including
> historical ones.
> We also want to be able to expose those metrics through JMX, and probably
> through other monitoring systems such as nagios.
> A library that could be useful here is codahale's metrics
> http://metrics.codahale.com/ , but there are alternatives that could be
> evaluated as well.
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