[jira] [Comment Edited] (FLINK-9090) Replace UUID.randomUUID with more efficient PRNG

["Greg Hogan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-9090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16415910#comment-16415910 ] 

Greg Hogan edited comment on FLINK-9090 at 3/27/18 6:30 PM:
------------------------------------------------------------

Why the need to be deterministic (and user configurable?) and where is this called on a hot path?


was (Author: greghogan):
Why the need to be deterministic (and user configurable?) and where is this called on from a hot path?

> Replace UUID.randomUUID with more efficient 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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