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Posted to issues@hive.apache.org by "Rajesh Balamohan (Jira)" <ji...@apache.org> on 2020/07/14 04:18:00 UTC

[jira] [Assigned] (HIVE-23843) Improve key evictions in VectorGroupByOperator

     [ https://issues.apache.org/jira/browse/HIVE-23843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rajesh Balamohan reassigned HIVE-23843:
---------------------------------------

    Assignee: Rajesh Balamohan

> Improve key evictions in VectorGroupByOperator
> ----------------------------------------------
>
>                 Key: HIVE-23843
>                 URL: https://issues.apache.org/jira/browse/HIVE-23843
>             Project: Hive
>          Issue Type: Improvement
>          Components: Hive
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Major
>
> Keys in {{mapKeysAggregationBuffers}} are evicted in random order. Tasks also get into GC issues when multiple keys are involved in groupbys. It would be good to provide an option to have LRU based eviction for mapKeysAggregationBuffers.



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