[jira] [Resolved] (LUCENE-8619) Decrease I/O pressure of OfflineSorter

["Adrien Grand (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-8619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand resolved LUCENE-8619.
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    Resolution: Not A Problem

This isn't a problem anymore now that Ignacio rewrote the merging of BKD trees as a selection problem rathen than a sorting problem.

> Decrease I/O pressure of OfflineSorter
> --------------------------------------
>
>                 Key: LUCENE-8619
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8619
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>
> OfflineSorter is likely I/O bound, yet it doesn't really try to relieve I/O. For instance it always writes the length on 2 bytes, which is waseful when used by BKDWriter since all byte[] arrays have exactly the same length. For LatLonPoint, this is a 25% space overhead that we could remove.
> Doing lightweight compression on the fly might also help.
> As a data point, Ignacio told me that after indexing 60M shapes with LatLonShape (1.65B triangles), the index directory was about 265GB and dropped to 57GB when merging was over.



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