[jira] [Resolved] (LUCENE-8598) Improve field updates packed values

["Simon Willnauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-8598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer resolved LUCENE-8598.
-------------------------------------
    Resolution: Fixed

> Improve field updates packed values
> -----------------------------------
>
>                 Key: LUCENE-8598
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8598
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Simon Willnauer
>            Priority: Major
>             Fix For: master (8.0), 7.7
>
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
>  DocValuesFieldUpdats are using compact settings for packet ints that causes
>     dramatic slowdowns when the updates are finished and sorted. Moving to the default
>     accepted overhead ratio yields up to 4x improvements in applying updates. This change
>     also improves the packing of numeric values since we know the value range in advance and
>     can choose a different packing scheme in such a case.
>     Overall this change yields a good performance improvement since 99% of the times of applying
>     DV field updates are spend in the sort method which essentially makes applying the updates
>     4x faster.



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