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https://issues.apache.org/jira/browse/LUCENE-8600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718992#comment-16718992
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Simon Willnauer commented on LUCENE-8600:
-----------------------------------------
to be honest I am not very much concerned about this causing OOMs. In the worst
case we would use 4 byte per ord x the number of updates in the package that
means we need about 300k updates to consume ~1MB of RAM here. I think that is
an unlikely scenario. Additionally this is transient memory so I thin we are
good here [~dweiss]
+1 to the patch from my side
> DocValuesFieldUpdates should use a better sort
> ----------------------------------------------
>
> Key: LUCENE-8600
> URL: https://issues.apache.org/jira/browse/LUCENE-8600
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-8600.patch
>
>
> This is a follow-up to LUCENE-8598: Simon identified that swaps are a
> bottleneck to applying doc-value updates, in particular due to the overhead
> of packed ints. It turns out that InPlaceMergeSorter does LOTS of swaps in
> order to perform in-place. Replacing with a more efficient sort should help.
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