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Posted to issues@lucene.apache.org by "Adrien Grand (Jira)" <ji...@apache.org> on 2021/10/11 15:59:00 UTC
[jira] [Commented] (LUCENE-10165) Implement
Lucene90DocValuesProducer#getMergeInstance
[ https://issues.apache.org/jira/browse/LUCENE-10165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17427221#comment-17427221 ]
Adrien Grand commented on LUCENE-10165:
---------------------------------------
The linked PR improved doc values merge times by 11% on the NYC taxis benchmark.
> Implement Lucene90DocValuesProducer#getMergeInstance
> ----------------------------------------------------
>
> Key: LUCENE-10165
> URL: https://issues.apache.org/jira/browse/LUCENE-10165
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The Lucene90 doc values producer optimizes for random access so that selective queries only have to decode the values that they need for sorting or faceting.
> However, in the case of merging, the merging process systematically consumes all doc IDs / values sequentially, so we could optimize for this access pattern via the merge instance?
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