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Posted to issues@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2018/05/17 03:32:00 UTC

[jira] [Assigned] (HIVE-18866) Semijoin: Implement a Long -> Hash64 vector fast-path

     [ https://issues.apache.org/jira/browse/HIVE-18866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Shelukhin reassigned HIVE-18866:
---------------------------------------

    Assignee: Sergey Shelukhin

> Semijoin: Implement a Long -> Hash64 vector fast-path
> -----------------------------------------------------
>
>                 Key: HIVE-18866
>                 URL: https://issues.apache.org/jira/browse/HIVE-18866
>             Project: Hive
>          Issue Type: Improvement
>          Components: Vectorization
>            Reporter: Gopal V
>            Assignee: Sergey Shelukhin
>            Priority: Major
>              Labels: performance
>         Attachments: 0001-hash64-WIP.patch, HIVE-18866.patch, perf-hash64-long.png
>
>
> A significant amount of CPU is wasted with JMM restrictions on byte[] arrays.
> To transform from one Long -> another Long, this goes into a byte[] array, which shows up as a hotspot.
> !perf-hash64-long.png!



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