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https://issues.apache.org/jira/browse/LUCENE-9211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17039132#comment-17039132
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ASF subversion and git services commented on LUCENE-9211:
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Commit bcdc21a0013709095abee1c588b3271a14949ea2 in lucene-solr's branch
refs/heads/branch_8x from markharwood
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=bcdc21a ]
LUCENE-9211 Add compression for Binary doc value fields (#1234)
Stores groups of 32 binary doc values in LZ4-compressed blocks.
(cherry picked from commit f549ee353530fcd48390a314aff9ec1723b47346)
> Adding compression to BinaryDocValues storage
> ---------------------------------------------
>
> Key: LUCENE-9211
> URL: https://issues.apache.org/jira/browse/LUCENE-9211
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Reporter: Mark Harwood
> Assignee: Mark Harwood
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> While SortedSetDocValues can be used today to store identical values in a
> compact form this is not effective for data with many unique values.
> The proposal is that BinaryDocValues should be stored in LZ4 compressed
> blocks which can dramatically reduce disk storage costs in many cases. The
> proposal is blocks of a number of documents are stored as a single compressed
> blob along with metadata that records offsets where the original document
> values can be found in the uncompressed content.
> There's a trade-off here between efficient compression (more docs-per-block =
> better compression) and fast retrieval times (fewer docs-per-block = faster
> read access for single values). A fixed block size of 32 docs seems like it
> would be a reasonable compromise for most scenarios.
> A PR is up for review here [https://github.com/apache/lucene-solr/pull/1234]
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