[jira] [Commented] (CASSANDRA-7338) CFS.getRangeSlice should update latency metrics

["Chris Lohfink (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14275507#comment-14275507 ] 

Chris Lohfink commented on CASSANDRA-7338:
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Could we actually include the EstimatedHistogram version that was cut out in v3?  The Metrics histogram is pretty bad at non-normal data like latencies and (empirically tested and theoretically) is untrustworthy at 99th percentile.  For applications that care about the percentiles having the more statistically accurate version is beneficial.

> CFS.getRangeSlice should update latency metrics
> -----------------------------------------------
>
>                 Key: CASSANDRA-7338
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7338
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Trivial
>             Fix For: 2.1 rc2
>
>         Attachments: 7338-3.txt, CASSANDRA-7338-v2.txt, CASSANDRA-7338.txt
>
>
> CFS.getRangeSlice doesn't update the CF readLatency metric in the same way as CFS.getColumnFamily does. 
> I may be missing something, but I couldn't see a good reason why this wasn't already the case as without it, "SELECT * FROM t WHERE x=y" results in the read metrics being incremented, but "SELECT * FROM t" doesn't.



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