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Posted to issues@flink.apache.org by "Hai Zhou (JIRA)" <ji...@apache.org> on 2018/03/27 01:09:00 UTC

[jira] [Assigned] (FLINK-9090) Replace UUID.randomUUID with deterministic PRNG

     [ https://issues.apache.org/jira/browse/FLINK-9090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hai Zhou reassigned FLINK-9090:
-------------------------------

    Assignee: Hai Zhou

> Replace UUID.randomUUID with deterministic PRNG
> -----------------------------------------------
>
>                 Key: FLINK-9090
>                 URL: https://issues.apache.org/jira/browse/FLINK-9090
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Hai Zhou
>            Priority: Major
>
> 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



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