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From "Ashu Pachauri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17627) Active workers metric for thrift
Date Tue, 14 Feb 2017 21:08:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15866682#comment-15866682

Ashu Pachauri commented on HBASE-17627:

[~ghelmling] The test failures seem unrelated. I checked the test case, it waits for thrift
server to start for 10 seconds and then gives up; this may be a flaky test case. Also, it
succeeded several times locally for me. 

bq. They way we currently expose number of active handlers, here and in the RpcServer, is
a bit flawed. Since it is a point in time metric, it can miss spikes in activity which clear
before the metrics collection happen. Ultimately it might be better to report something like
"number of handler milliseconds consumed" (millis duration for each call, summed up), but
that is really a separate discussion.

Agreed. Thrift servers expose per call type processing time histograms (putMultiple, getScannerRows
etc) which may be indicative of how busy thrift workers are, though it's often skewed by a
small percentage of slow calls going to only a fraction of workers.

> Active workers metric for thrift
> --------------------------------
>                 Key: HBASE-17627
>                 URL: https://issues.apache.org/jira/browse/HBASE-17627
>             Project: HBase
>          Issue Type: Improvement
>          Components: Thrift
>            Reporter: Ashu Pachauri
>            Assignee: Ashu Pachauri
>         Attachments: HBASE-17627.master.001.patch
> It would be good to have a metric for number of active handlers on thrift servers, which
gives a good indication of business of a thrift server.

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