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From "Mikhail Stepura (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6153) Stress stopped calculating latency stats
Date Tue, 08 Oct 2013 06:49:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13788977#comment-13788977
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Mikhail Stepura commented on CASSANDRA-6153:
--------------------------------------------

I believe it's related to https://github.com/apache/cassandra/commit/5dabd1cc0c65b329ff518d7ad3f09e4c11494f18
Not sure why we need to convert from nanos there

> Stress stopped calculating latency stats
> ----------------------------------------
>
>                 Key: CASSANDRA-6153
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6153
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: Ryan McGuire
>            Assignee: Mikhail Stepura
>             Fix For: 2.1
>
>
> In trunk, cassandra-stress has stopped calculating all latency information:
> From trunk:
> {code}
> $ ccm node1 stress
> Created keyspaces. Sleeping 1s for propagation.
> total,interval_op_rate,interval_key_rate,latency,95th,99.9th,elapsed_time
> 89995,8999,8999,0.0,0.0,0.0,10
> 304267,21427,21427,0.0,0.0,0.0,20
> 514791,21052,21052,0.0,0.0,0.0,30
> 727471,21268,21268,0.0,0.0,0.0,40
> 926467,19899,19899,0.0,0.0,0.0,50
> 1000000,7353,7353,0.0,0.0,0.0,54
> Averages from the middle 80% of values:
> interval_op_rate          : 21249
> interval_key_rate         : 21249
> latency median            : 0.0
> latency 95th percentile   : 0.0
> latency 99.9th percentile : 0.0
> Total operation time      : 00:00:54
> END
> {code}
> From 2.0:
> {code}
> $ ccm node1 stress
> Created keyspaces. Sleeping 1s for propagation.
> total,interval_op_rate,interval_key_rate,latency,95th,99.9th,elapsed_time
> 66720,6672,6672,0.2,25.6,201.6,10
> 289577,22285,22285,0.2,3.4,201.1,20
> 489105,19952,19952,0.2,1.8,201.2,30
> 660916,17181,17181,0.2,1.6,87.9,40
> 847452,18653,18653,0.2,1.6,108.8,50
> 1000000,15254,15254,0.2,1.6,108.9,59
> Averages from the middle 80% of values:
> interval_op_rate          : 19517
> interval_key_rate         : 19517
> latency median            : 0.2
> latency 95th percentile   : 2.1
> latency 99.9th percentile : 149.8
> Total operation time      : 00:00:59
> END
> {code}



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