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From "Chris Goffinet (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-724) Insert/Get Contention
Date Wed, 20 Jan 2010 08:27:58 GMT
Insert/Get Contention
---------------------

                 Key: CASSANDRA-724
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-724
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.6
            Reporter: Chris Goffinet
         Attachments: test_case.py

We tried out the socket io patch in CASSANDRA-705, tested the latest JVM of b18 for 1.6. Still
seeing very strange insert times. We see this with get_slices as well but it's easy to reproduce
with batch_insert. I wonder if its related to Memtable contention, it's pretty easy to see
the slow times when you restart the test script attached. We are running this on a 7 node
cluster, <1% cpu. Consistency Level of 1.

Results
---------------------
Slow insert test.10882 0.203548192978
Slow insert test.18005 0.203876972198
Slow insert test.21154 0.204496860504
Slow insert test.22054 0.0444049835205
Slow insert test.26445 0.201545000076

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