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From "Mikhail Mazursky (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-5581) Use System.nanoTime() to measure intervals
Date Sun, 19 May 2013 13:27:16 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikhail Mazursky updated CASSANDRA-5581:
----------------------------------------

    Attachment: trunk-5581.txt

Attaching proposed patch.
                
> 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
>         Attachments: trunk-5581.txt
>
>
> 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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