[jira] [Commented] (CASSANDRA-11518) o.a.c.utils.UUIDGen clock generation is not very high in entropy

["Branimir Lambov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-11518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15268956#comment-15268956 ] 

Branimir Lambov commented on CASSANDRA-11518:
---------------------------------------------

LGTM

> 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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