Mikhail Mazursky created CASSANDRA-5581:
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Summary: Use System.nanoTime() to measure intervals
Key: CASSANDRA-5581
URL: https://issues.apache.org/jira/browse/CASSANDRA-5581
Project: Cassandra
Issue Type: Improvement
Reporter: Mikhail Mazursky
Priority: Critical
System.nanoTime() should always be prefered to System.currentTimeMillis() to
measure time intervals. It's not affected by system clock adjustments & drift.
While testing C* we found that it's very unstable if system clock drifts.
Problems happen even under low load with tiny dataset. In our case other VMs on
the same hardware box produced high CPU load and system clock drifted a lot in
C* VMs. We fixed that but there is definitelly room for improvement in C*
itself.
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