Atri Sharma created LUCENE-8963:
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             Summary: Allow Collectors To "Publish" If They Can Be Used In 
Concurrent Search
                 Key: LUCENE-8963
                 URL: https://issues.apache.org/jira/browse/LUCENE-8963
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Atri Sharma


There is an implied assumption today that all we need to run a query 
concurrently is a CollectorManager implementation. While that is true, there 
might be some corner cases where a Collector's semantics do not allow it to be 
concurrently executed (think of ES's aggregates). If a user manages to write a 
CollectorManager with a Collector that is not really concurrent friendly, we 
could end up in an undefined state.

 

This Jira is more of a rhetorical discussion, and to explore if we should allow 
Collectors to implement an API which simply returns a boolean signifying if a 
Collector is parallel ready or not. The default would be true, until a 
Collector explicitly overrides it?



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