Yonik Seeley created SOLR-8909:
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Summary: Streaming Expressions should leverage streaming facets
Key: SOLR-8909
URL: https://issues.apache.org/jira/browse/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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