[LUCENE-4769] Add a CountingFacetsAggregator which reads ordinals from a cache

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.2, 6.0
• Component/s: modules/facet
• Lucene Fields: New, Patch Available
• Assignee: Shai Erera
• Reporter: Shai Erera
• Created: 11/Feb/13 11:58
• Updated: 28/Aug/22 13:39
• Resolved: 12/Feb/13 16:40

Description

Mike wrote a prototype of a FacetsCollector which reads ordinals from a CachedInts structure on LUCENE-4609. I ported it to the new facets API, as a FacetsAggregator. I think we should offer users the means to use such a cache, even if it consumes more RAM. Mike tests show that this cache consumed x2 more RAM than if the DocValues were loaded into memory in their raw form. Also, a PackedInts version of such cache took almost the same amount of RAM as straight int[], but the gains were minor.

I will post the patch shortly.