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Posted to issues@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2018/08/10 20:49:00 UTC

[jira] [Updated] (HIVE-20364) Update default for hive.map.aggr.hash.min.reduction

     [ https://issues.apache.org/jira/browse/HIVE-20364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashutosh Chauhan updated HIVE-20364:
------------------------------------
    Status: Patch Available  (was: Open)

> Update default for hive.map.aggr.hash.min.reduction
> ---------------------------------------------------
>
>                 Key: HIVE-20364
>                 URL: https://issues.apache.org/jira/browse/HIVE-20364
>             Project: Hive
>          Issue Type: Improvement
>          Components: Configuration
>            Reporter: Nita Dembla
>            Assignee: Ashutosh Chauhan
>            Priority: Major
>         Attachments: HIVE-20364.patch
>
>
> Default value is 0.5 Lets update it to 0.99
> In average case its a trade-off between cpu vs network. Erring on side of CPU is better since perf loss caused by network is usually larger.



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