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Posted to issues@lucene.apache.org by "Adrien Grand (Jira)" <ji...@apache.org> on 2020/11/12 21:43:00 UTC
[jira] [Resolved] (LUCENE-9378) Configurable compression for
BinaryDocValues
[ https://issues.apache.org/jira/browse/LUCENE-9378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand resolved LUCENE-9378.
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Fix Version/s: 8.8
Resolution: Fixed
> Configurable compression for BinaryDocValues
> --------------------------------------------
>
> Key: LUCENE-9378
> URL: https://issues.apache.org/jira/browse/LUCENE-9378
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Viral Gandhi
> Priority: Major
> Fix For: 8.8
>
> Attachments: hotspots-v76x.png, hotspots-v76x.png, hotspots-v76x.png, hotspots-v76x.png, hotspots-v76x.png, hotspots-v77x.png, hotspots-v77x.png, hotspots-v77x.png, hotspots-v77x.png, image-2020-06-12-22-17-30-339.png, image-2020-06-12-22-17-53-961.png, image-2020-06-12-22-18-24-527.png, image-2020-06-12-22-18-48-919.png, snapshot-v77x.nps, snapshot-v77x.nps, snapshot-v77x.nps, snapshots-v76x.nps, snapshots-v76x.nps, snapshots-v76x.nps
>
> Time Spent: 5h 40m
> Remaining Estimate: 0h
>
> Lucene 8.5.1 includes a change to always [compress BinaryDocValues|https://issues.apache.org/jira/browse/LUCENE-9211]. This caused (~30%) reduction in our red-line QPS (throughput).
> We think users should be given some way to opt-in for this compression feature instead of always being enabled which can have a substantial query time cost as we saw during our upgrade. [~mikemccand] suggested one possible approach by introducing a *mode* in Lucene80DocValuesFormat (COMPRESSED and UNCOMPRESSED) and allowing users to create a custom Codec subclassing the default Codec and pick the format they want.
> Idea is similar to Lucene50StoredFieldsFormat which has two modes, Mode.BEST_SPEED and Mode.BEST_COMPRESSION.
> Here's related issues for adding benchmark covering BINARY doc values query-time performance - [https://github.com/mikemccand/luceneutil/issues/61]
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