[jira] [Assigned] (ARROW-5482) [Java] reduce heap footprint of ValueVectors

["Todd Farmer (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5482?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Farmer reassigned ARROW-5482:
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    Assignee:     (was: Pindikura Ravindra)

This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

> [Java] reduce heap footprint of ValueVectors
> --------------------------------------------
>
>                 Key: ARROW-5482
>                 URL: https://issues.apache.org/jira/browse/ARROW-5482
>             Project: Apache Arrow
>          Issue Type: Task
>          Components: Java
>            Reporter: Pindikura Ravindra
>            Priority: Major
>
> In some scenarios, we hold lots of value vectors in memory eg. during join, aggregation. The heap analysis shows that the costs are as follows for a simple IntVector (used VisualVM on mac) :
>  
> IntVector : 80 bytes
> vector.types.pojo.FieldType : 41 bytes
> vector.types.pojo.Field : 40 bytes
> IntReaderImpl : 28 bytes
>  
> I'll use this Jira to track ways to reduce the heap usage.
>  



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