[jira] [Comment Edited] (HIVE-15573) Vectorization: ACID shuffle ReduceSink is not specialized

["Gopal V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-15573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15816767#comment-15816767 ] 

Gopal V edited comment on HIVE-15573 at 1/11/17 1:31 AM:
---------------------------------------------------------

The timings for Map 1 went from 85s -> 13s, when vectorization (incorrectly bucketed) applied to this ReduceSink.

Some part of that gain will be negated by the proper bucketing, with an estimated ~2x speedup to the mapper tasks when this is fixed.


was (Author: gopalv):
The timings for Map 1 went from 85s -> 13s, when vectorization (incorrectly bucketed) applied to this ReduceSink.

> 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
>         Attachments: 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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