[jira] [Assigned] (HIVE-21426) Remove Utilities Global Random

["David Mollitor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21426?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Mollitor reassigned HIVE-21426:
-------------------------------------

    Assignee: David Mollitor

> Remove Utilities Global Random
> ------------------------------
>
>                 Key: HIVE-21426
>                 URL: https://issues.apache.org/jira/browse/HIVE-21426
>             Project: Hive
>          Issue Type: Improvement
>          Components: HiveServer2
>    Affects Versions: 4.0.0, 3.2.0
>            Reporter: David Mollitor
>            Assignee: David Mollitor
>            Priority: Minor
>
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java#L253
> Remove global {{Random}} object in favor of {{ThreadLocalRandom}}.
> {quote}
> ThreadLocalRandom is initialized with an internally generated seed that may not otherwise be modified. When applicable, use of ThreadLocalRandom rather than shared Random objects in concurrent programs will typically encounter much less overhead and contention.
> {quote}
> https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadLocalRandom.html



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