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Posted to issues@lucene.apache.org by "Adrien Grand (Jira)" <ji...@apache.org> on 2021/07/29 13:34:00 UTC
[jira] [Resolved] (LUCENE-10031) Speedup to SortedDocIDMerger when
sorting on low-cardinality fields
[ https://issues.apache.org/jira/browse/LUCENE-10031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand resolved LUCENE-10031.
-----------------------------------
Fix Version/s: 8.10
Resolution: Fixed
> Speedup to SortedDocIDMerger when sorting on low-cardinality fields
> -------------------------------------------------------------------
>
> Key: LUCENE-10031
> URL: https://issues.apache.org/jira/browse/LUCENE-10031
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 8.10
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> I've been looking at profiles of indexing with index sorting enabled and saw non-negligible time spent in SortedDocIDMerger. This isn't completely surprising as this little class is called on every document whenever merging postings, doc values, stored fields, etc.
> I'm especially interested in cases when the sort key is on a low cardinality field, so the priority queue doesn't get reordered often. I've been playing with a change to SortedDocIdMerger that makes merging significantly faster in that case.
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