[CASSANDRA-724] Insert/Get Contention

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 0.6
• Severity: Normal
• Assignee: Jonathan Ellis
• Reporter: Chris Goffinet

Authors

Jonathan Ellis

• Created: 20/Jan/10 08:26
• Updated: 16/Apr/19 09:33
• Resolved: 04/Feb/10 19:59

Description

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
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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