Michael McCandless created LUCENE-7905: ------------------------------------------
Summary: Optimizations for OrdinalMap Key: LUCENE-7905 URL: https://issues.apache.org/jira/browse/LUCENE-7905 Project: Lucene - Core Issue Type: Improvement Reporter: Michael McCandless Assignee: Michael McCandless Fix For: 7.1 Attachments: LUCENE-7905.patch {{OrdinalMap}} is a useful class to quickly map per-segment ordinals to global space, but it's fairly costly to build, which must typically be done on every NRT refresh. I'm using it quite heavily in two different places, one for {{SortedSetDocValuesFacetCounts}}, and another custom usage, and I found some small optimizations to improve its construction time. I switched it to use a simple priority queue to merge the terms instead of the more general {{MultiTermsEnum}}, which does extra work since it must also provide postings, implement seekExact, etc. I also pulled {{OrdinalMap}} out into its own oal.index class. When testing construction time for my case the patch is ~16% faster (159.9s -> 134.2s) in one case with 91.4 M terms and ~9% faster (115.6s -> 105.7s) in another case with 26.6 M terms. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org