Michael Braun created LUCENE-8434:
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Summary: Use shared instance of CollectionTerminatedException
Key: LUCENE-8434
URL: https://issues.apache.org/jira/browse/LUCENE-8434
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael Braun
Creating exceptions and filling in the stack is expensive (see SOLR-11242 and
SOLR-11314 for two such examples). CollectionTerminatedException is used as a
signaling mechanism - there are zero instances in code that actually log that
it occurred or make use of anything other than the fact that it occurred
(unlike Solr's EarlyTerminatingCollectorException, for instance). Exceptions
really should be for something exceptional - the use of
CollectionTerminatedException is in place of polluting return values with this
condition and is just used as a signal to callers.
Because CollectionTerminatedException is never inspected directly and is
effectively a different return condition, it doesn't make as much sense to
generate new Exceptions with fresh stack traces every time - either change the
signatures or share the object.
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