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https://issues.apache.org/jira/browse/LUCENE-8598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714051#comment-16714051
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Simon Willnauer commented on LUCENE-8598:
-----------------------------------------
I ran a benchmark to update 10000 values on a single segment 100 times:
||setup||patch time in ms||master time in ms||
|shared single value|10131|38430|
|random values|30985|69600|
> 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: 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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