hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15789) Vectorization: limit reduce vectorization to 32Mb chunks
Date Wed, 08 Feb 2017 06:23:41 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857479#comment-15857479
] 

Gopal V commented on HIVE-15789:
--------------------------------

LGTM - +1.

> Vectorization: limit reduce vectorization to 32Mb chunks
> --------------------------------------------------------
>
>                 Key: HIVE-15789
>                 URL: https://issues.apache.org/jira/browse/HIVE-15789
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>            Reporter: Gopal V
>            Assignee: Teddy Choi
>         Attachments: HIVE-15789.1.patch, HIVE-15789.2.patch
>
>
> Reduce vectorization accumulates 1024 rows before forwarding it into the reduce processor.
> Add a safety limit for 32Mb of writables, so that shorter sequences can be forwarded
into the operator trees.
> {code}
>         rowIdx++;
>         if (rowIdx >= BATCH_SIZE) {
>           VectorizedBatchUtil.setBatchSize(batch, rowIdx);
>           reducer.process(batch, tag);
> {code}



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

Mime
View raw message