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Posted to commits@cassandra.apache.org by "Ryan McGuire (JIRA)" <ji...@apache.org> on 2013/09/21 02:18:52 UTC

[jira] [Created] (CASSANDRA-6074) Read regression in 2.0.1

Ryan McGuire created CASSANDRA-6074:
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             Summary: Read regression in 2.0.1
                 Key: CASSANDRA-6074
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6074
             Project: Cassandra
          Issue Type: Bug
            Reporter: Ryan McGuire
         Attachments: stress 2.0.0 vs 2.0.01.png

I'm seeing a regression in stress reads introduced in 2.0.1.

Setup
 * 4 node cluster using default settings
 * Write: -F 30000000 -n 30000000 -i 5 -l 2
 * Read: -n 30000000 -o read -i 5

I tried this three times on 2.0.0 and on 2.0.1(tentative; eb96db6c)

2.0.0 is fine, but 2.0.1 timed out of it's read 2 out of the 3 times:

!stress 2.0.0 vs 2.0.01.png!

[Data can be viewed here|http://ryanmcguire.info/ds/graph/graph.html?stats=stats.2.0.0v2.0.1.json&metric=interval_op_rate&operation=stress-read&smoothing=4]

I will bisect and update this when I find the commit that introduced this.

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