[jira] [Created] (LUCENE-4625) Make TotalFacetCounts per-segment

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

Shai Erera created LUCENE-4625:
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             Summary: Make TotalFacetCounts per-segment
                 Key: LUCENE-4625
                 URL: https://issues.apache.org/jira/browse/LUCENE-4625
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Shai Erera


TotalFacetCounts are used during complements computation today. They are not per-segment and therefore are not NRT friendly. Even regardless to NRT, you need to compute them entirely from scratch whenever you reopen IR.

It would be good if we can develop them per-segment. If e.g. AtomicReader had a notion of cachable objects, it could be such an object. That has been discussed many times in the past though, without a consensus. So perhaps we can have a FacetsAtomicReader which manages TFC. But that creates other issues too, like who instantiates that AtomicReader (i.e. we'd need a FacetsCompositeReader too, and potentially IW would need to init that type) ...

Let's explore these options, but in general it would be good to have TFC per-segment.

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