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Date: Mon, 23 Jan 2017 08:07:26 +0000 (UTC)
From: "Matt McCline (JIRA)" <jira@apache.org>
To: issues@hive.apache.org
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Subject: [jira] [Updated] (HIVE-15573) Vectorization: ACID shuffle
 ReduceSink is not specialized
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archived-at: Mon, 23 Jan 2017 08:07:34 -0000


     [ https://issues.apache.org/jira/browse/HIVE-15573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt McCline updated HIVE-15573:
--------------------------------
    Status: In Progress  (was: Patch Available)

> Vectorization: ACID shuffle ReduceSink is not specialized 
> ----------------------------------------------------------
>
>                 Key: HIVE-15573
>                 URL: https://issues.apache.org/jira/browse/HIVE-15573
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions, Vectorization
>    Affects Versions: 2.2.0
>            Reporter: Gopal V
>            Assignee: Matt McCline
>             Fix For: 2.2.0
>
>         Attachments: HIVE-15573.01.patch, HIVE-15573.02.patch, screenshot-1.png
>
>
> The ACID shuffle disabled murmur hash for the shuffle, due to the bucketing requirements demanding the writable hashcode for the shuffles.
> {code}
>     boolean useUniformHash = desc.getReducerTraits().contains(UNIFORM);
>     if (!useUniformHash) {
>       return false;
>     }
> {code}
> This check protects the fast ReduceSink ops from being used in ACID inserts.
> A specialized case for the following pattern will make ACID insert much faster.
> {code}
>                     Reduce Output Operator
>                       sort order: 
>                       Map-reduce partition columns: _col0 (type: bigint)
>                       value expressions:  ....
> {code}
> !screenshot-1.png!


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