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From "Yonik Seeley (JIRA)" <>
Subject [jira] [Created] (SOLR-8909) Streaming Expressions should leverage streaming facets
Date Sat, 26 Mar 2016 01:08:25 GMT
Yonik Seeley created SOLR-8909:

             Summary: Streaming Expressions should leverage streaming facets
                 Key: SOLR-8909
             Project: Solr
          Issue Type: Bug
            Reporter: Yonik Seeley

The JSON Facet API can currently stream facets (use method=stream) from a single node.  Each
facet bucket is calculated as it is written out, so field cardinality has no effect on memory.

This is only from a single node - normal distributed search/faceting does not stream...  But
that's what streaming expressions are for anyway!

One current caveat: streaming currently only works with "sort=index asc" (the term order in
the Lucene index).
Future work could allow more complex sorts, at the cost of some memory to calculate the sort
criteria for each bucket prior to streaming out.  Of course more complex sorts would require
more complex merging logic (i.e. even a sort by bucket count is not a simple merge sort and
requires more buffering in the merging node).

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