[LUCENE-7588] A parallel DrillSideways implementation

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.3.1, 7.0
• Fix Version/s: 6.4, 7.0
• Labels: facet faceting
• Lucene Fields: New, Patch Available
• Assignee: Unassigned
• Reporter: Emmanuel Keller
• Created: 09/Dec/16 15:59
• Updated: 28/Aug/22 15:07
• Resolved: 03/Jan/17 11:43

Description

Currently DrillSideways implementation is based on the single threaded IndexSearcher.search(Query query, Collector results).

On large document set, the single threaded collection can be really slow.

The ParallelDrillSideways implementation could:

1. Use the CollectionManager based method IndexSearcher.search(Query query, CollectorManager collectorManager) to get the benefits of multithreading on index segments,
2. Compute each DrillSideway subquery on a single thread.