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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-15789) Vectorization: limit reduce vectorization to 32Mb chunks
Date Wed, 22 Mar 2017 21:03:41 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HIVE-15789:
---------------------------
       Resolution: Fixed
    Fix Version/s: 2.2.0
     Release Note: Vectorization: limit reduce vectorization to 32Mb chunks (Teddy Choi, via
Gopal V)
           Status: Resolved  (was: Patch Available)

Pushed to master, thanks [~teddy.choi]

> 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
>             Fix For: 2.2.0
>
>         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}



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