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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