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From "Radim Kolar (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3460) Increase precision of elapsed time in casandra-cli
Date Fri, 11 Nov 2011 06:24:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148293#comment-13148293
] 

Radim Kolar commented on CASSANDRA-3460:
----------------------------------------

during latency testing i discovered that ideal will be to have sub millisecond latency rounded
to 2 digits displayed if result is < 10 ms. 

Because after cassandra heap gets more full, its latency is increased about 0.5 ms making
result > 1 ms in most common cases for rows not found. Cassandra flush push latency under
1 ms again.
                
> Increase precision of elapsed time in casandra-cli
> --------------------------------------------------
>
>                 Key: CASSANDRA-3460
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3460
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>    Affects Versions: 1.0.2
>            Reporter: Radim Kolar
>            Priority: Minor
>
> Cassandra often return response in less then < 1 ms
> from another datacenter
> [default@test] get sipdb[23];
> Returned 0 results.
> Elapsed time: 219 msec(s).
> from own dataceter
> [default@test] get sipdb[13];
> Returned 0 results.
> Elapsed time: 0 msec(s).
> Precession of this timer needs to be increased a bit, while looking at network latency
adding 1 number should be enough like : 0.2 ms should be sufficient. 
> It would be good to display sub milliseconds only if time elapsed is < 1 ms.

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