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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-11518) o.a.c.utils.UUIDGen clock generation is not very high in entropy
Date Tue, 03 May 2016 18:23:13 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-11518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joshua McKenzie updated CASSANDRA-11518:
----------------------------------------
    Reviewer: Branimir Lambov  (was: Joel Knighton)

> o.a.c.utils.UUIDGen clock generation is not very high in entropy
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-11518
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11518
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>            Priority: Trivial
>             Fix For: 3.0.x, 3.x
>
>
> makeClockSeqAndNode uses {{java.util.Random}} to generate the clock. {{Random}} only
has 48-bits of internal state so it's not going to generate the best bits for clock and in
addition to that it uses a collision prone seed that sort of defeats the purpose of clock
sequence.
> A better approach to get the most out of those 14-bits would be to use {{SecureRandom}}
with something like SHA1PRNG.



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