[jira] [Created] (LUCENE-10000) MultiCollectorManager should have parity with MultiCollector behavior

["Greg Miller (Jira)" <ji...@apache.org>]

Greg Miller created LUCENE-10000:
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             Summary: MultiCollectorManager should have parity with MultiCollector behavior
                 Key: LUCENE-10000
                 URL: https://issues.apache.org/jira/browse/LUCENE-10000
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/search
    Affects Versions: main (9.0)
            Reporter: Greg Miller
            Assignee: Greg Miller


The behavior of {{MultiCollectorManager}} and {{MultiCollector}} differ with respect to how they handle {{CollectionTerminationException}} and minCompetitiveScore calls.

In {{MultiCollector}}, remaining collectors will continue collecting when one or more have thrown a {{CollectionTerminationException}}, but {{MultiCollectorManager}} will allow the exception to propagate and stop collecting against all collectors as soon as one throws (see: LUCENE-6772).

Also, {{MultiCollector}} properly handles setting of min competitive scores by ensuring the lowest set across all wrapped collectors is used, or by making it a no-op in cases where at least one collector is using {{ScoreMode.COMPLETE}} (see: LUCENE-9402). {{MultiCollectorManager}} will share the same {{Scorable}} across all collectors, which seems like the wrong thing to do.

Finally, {{MultiCollector}} will cache scores when a {{Scorable}} is shared by more than one collector (see: LUCENE-6263).

We should update {{MultiCollectorManager}} to use common behavior with {{MultiCollector}} in all these areas. It should be easy to do by delegating to {{MultiCollector}} within {{MultiCollectorManager}}.



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