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From "Ryan McGuire (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-5933) 2.0 read performance is slower than 1.2
Date Tue, 03 Sep 2013 03:21:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756331#comment-13756331
] 

Ryan McGuire edited comment on CASSANDRA-5933 at 9/3/13 3:21 AM:
-----------------------------------------------------------------

Ah, OK, I can run that test, that also applies to CASSANDRA-5932. However, in this case, I
don't believe speculative retry can account for all the difference. The red line has none
enabled.
                
      was (Author: enigmacurry):
    Ah, OK, I can run that test, that also applies to CASSANDRA-5332. However, in this case,
I don't believe speculative retry can account for all the difference. The red line has none
enabled.
                  
> 2.0 read performance is slower than 1.2
> ---------------------------------------
>
>                 Key: CASSANDRA-5933
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5933
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Ryan McGuire
>         Attachments: 1.2-faster-than-2.0.png, 1.2-faster-than-2.0-stats.png
>
>
> Over the course of several tests I have observed that 2.0 read performance is noticeably
slower than 1.2
> Example:
> Blue line is 1.2, the rest are various forms of 2.0 rc1 (I've also seen this on rc2,
just don't have a good graph handy)
> !1.2-faster-than-2.0.png!
> !1.2-faster-than-2.0-stats.png!
> [See test data here|http://ryanmcguire.info/ds/graph/graph.html?stats=stats.eager_retry.node_killed.json&metric=interval_op_rate&operation=stress-read&smoothing=1]

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