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https://issues.apache.org/jira/browse/MESOS-4760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15257308#comment-15257308
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Joseph Wu commented on MESOS-4760:
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Most of the caching logic will remain the same. I'll be changing parts of
{{FetcherProcess::run}} and a tiny bit of logic in {{FetcherProcess::fetch}}.
It should be safe to add metrics in parallel, up until you need the injected
fetcher object.
> Expose metrics and gauges for fetcher cache usage and hit rate
> --------------------------------------------------------------
>
> Key: MESOS-4760
> URL: https://issues.apache.org/jira/browse/MESOS-4760
> Project: Mesos
> Issue Type: Improvement
> Components: fetcher, statistics
> Reporter: Michael Browning
> Assignee: Michael Browning
> Priority: Minor
> Labels: features, fetcher, statistics, uber
>
> To evaluate the fetcher cache and calibrate the value of the
> fetcher_cache_size flag, it would be useful to have metrics and gauges on
> agents that expose operational statistics like cache hit rate, occupied cache
> size, and time spent downloading resources that were not present.
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