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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2018/03/05 20:27:00 UTC

[jira] [Updated] (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 ]

Gopal V updated HIVE-18866:
---------------------------
    Attachment: perf-hash64-long.png

> Semijoin: Implement a Long -> Hash64 vector fast-path
> -----------------------------------------------------
>
>                 Key: HIVE-18866
>                 URL: https://issues.apache.org/jira/browse/HIVE-18866
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>            Reporter: Gopal V
>            Priority: Major
>         Attachments: 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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