[ https://issues.apache.org/jira/browse/LUCENE-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575441#comment-13575441 ]
Michael McCandless commented on LUCENE-4764: -------------------------------------------- The 30% RAM overhead I measured was for the 7 dims per doc case. And the RAM overhead will vary greatly depending on the app: if you have fewer facet dims, and more docs, the overhead is higher. I think it should just be an optional DV Format that makes the obvious tradeoffs, and the javadocs should say "your mileage may vary", ie the time/space tradeoff will be app dependent. > Faster but more RAM/Disk consuming DocValuesFormat for facets > ------------------------------------------------------------- > > Key: LUCENE-4764 > URL: https://issues.apache.org/jira/browse/LUCENE-4764 > Project: Lucene - Core > Issue Type: Improvement > Reporter: Michael McCandless > Assignee: Michael McCandless > Fix For: 4.2, 5.0 > > Attachments: LUCENE-4764.patch > > > The new default DV format for binary fields has much more > RAM-efficient encoding of the address for each document ... but it's > also a bit slower at decode time, which affects facets because we > decode for every collected docID. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org