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From "David Mollitor (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21426) Remove Utilities Global Random
Date Mon, 21 Oct 2019 13:32:00 GMT

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

David Mollitor updated HIVE-21426:
----------------------------------
    Status: Patch Available  (was: Open)

> 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
>              Labels: pull-request-available
>         Attachments: HIVE-21426.1.patch, HIVE-21426.2.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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