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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-6106) Provide timestamp with true microsecond resolution
Date Thu, 05 Feb 2015 18:35:36 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benedict resolved CASSANDRA-6106.
---------------------------------
    Resolution: Won't Fix

It was decided that v3 protocol implementors should ensure their timestamps are high precision,
since this is the default source of timestamps going forwards.

> Provide timestamp with true microsecond resolution
> --------------------------------------------------
>
>                 Key: CASSANDRA-6106
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6106
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>         Environment: DSE Cassandra 3.1, but also HEAD
>            Reporter: Christopher Smith
>            Assignee: Benedict
>            Priority: Minor
>              Labels: timestamps
>             Fix For: 3.0
>
>         Attachments: microtimstamp.patch, microtimstamp_random.patch, microtimstamp_random_rev2.patch
>
>
> I noticed this blog post: http://aphyr.com/posts/294-call-me-maybe-cassandra mentioned
issues with millisecond rounding in timestamps and was able to reproduce the issue. If I specify
a timestamp in a mutating query, I get microsecond precision, but if I don't, I get timestamps
rounded to the nearest millisecond, at least for my first query on a given connection, which
substantially increases the possibilities of collision.
> I believe I found the offending code, though I am by no means sure this is comprehensive.
I think we probably need a fairly comprehensive replacement of all uses of System.currentTimeMillis()
with System.nanoTime().



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