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https://issues.apache.org/jira/browse/FLINK-9090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16416063#comment-16416063
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Greg Hogan commented on FLINK-9090:
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Could you point to a case where use of {{UUID.randomUUID}} might affect
performance? I'm only seeing this used to name things (temp dirs, operators,
backends, etc.) rather than on the elementwise 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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