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Posted to issues@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2019/02/27 22:33:00 UTC

[jira] [Reopened] (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 reopened HIVE-20364:
-------------------------------------

> 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
>             Fix For: 4.0.0
>
>         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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