[jira] [Created] (LUCENE-4769) Add a CountingFacetsAggregator which reads ordinals from a cache

["Shai Erera (JIRA)" <ji...@apache.org>]

Shai Erera created LUCENE-4769:
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             Summary: Add a CountingFacetsAggregator which reads ordinals from a cache
                 Key: LUCENE-4769
                 URL: https://issues.apache.org/jira/browse/LUCENE-4769
             Project: Lucene - Core
          Issue Type: New Feature
          Components: modules/facet
            Reporter: Shai Erera
            Assignee: Shai Erera


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.

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