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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KYLIN-3317) Replace UUID.randomUUID with deterministic PRNG
Date Mon, 13 Aug 2018 07:06:00 GMT

    [ https://issues.apache.org/jira/browse/KYLIN-3317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16577896#comment-16577896
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ASF GitHub Bot commented on KYLIN-3317:
---------------------------------------

tttMelody opened a new pull request #197: KYLIN-3317, replace UUID.randomUUID with new UUID(ThreadLocalRandom.current().nextLong(),
ThreadLocalRandom.current().nextLong())
URL: https://github.com/apache/kylin/pull/197
 
 
   …urrent().nextLong(), ThreadLocalRandom.current().nextLong()).

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> Replace UUID.randomUUID with deterministic PRNG
> -----------------------------------------------
>
>                 Key: KYLIN-3317
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3317
>             Project: Kylin
>          Issue Type: Task
>          Components: Security
>            Reporter: Ted Yu
>            Assignee: jiatao.tao
>            Priority: Major
>             Fix For: v2.5.0
>
>
> Currently UUID.randomUUID is called in various places in the code base.
> * It is non-deterministic.
> * It uses a single secure random for UUID generation. This uses a single JVM wide lock,
and this can lead to lock contention and other performance problems.
> We should move to something that is deterministic by using seeded PRNGs
> {code}
> new UUID(ThreadLocalRandom.current().nextLong(), ThreadLocalRandom.current().nextLong())
> {code}



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