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Michael McCandless commented on LUCENE-9663: -------------------------------------------- {quote}Also +1 to test how slower building an OrdinalMap gets with this change. {quote} +1 too – this is done on every refresh, typically. > Adding compression to terms dict from SortedSet/Sorted DocValues > ---------------------------------------------------------------- > > Key: LUCENE-9663 > URL: https://issues.apache.org/jira/browse/LUCENE-9663 > Project: Lucene - Core > Issue Type: Improvement > Components: core/codecs > Reporter: Jaison.Bi > Priority: Trivial > Time Spent: 10m > Remaining Estimate: 0h > > Elasticsearch keyword field uses SortedSet DocValues. In our applications, > “keyword” is the most frequently used field type. > LUCENE-7081 has done prefix-compression for docvalues terms dict. We can do > better by replacing prefix-compression with LZ4. In one of our application, > the dvd files were ~41% smaller with this change(from 1.95 GB to 1.15 GB). > I've done simple tests based on the real application data, comparing the > write/merge time cost, and the on-disk *.dvd file size(after merge into 1 > segment). > || ||Before||After|| > |Write time cost(ms)|591972|618200| > |Merge time cost(ms)|270661|294663| > |*.dvd file size(GB)|1.95|1.15| > This feature is only for the high-cardinality fields. > I'm doing the benchmark test based on luceneutil. Will attach the report and > patch after the test. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org