Filtering Scala's Parallel Collections with early abort when desired number of results found

Question

Given a very large instance of collection.parallel.mutable.ParHashMap (or any other parallel collection), how can one abort a filtering parallel scan once a giv

Answer 1

I would first do parallel scan in which variable maxResults would be threadlocal. This would find up to (maxResults * numberOfThreads) results.

Then I would do single threaded scan to reduce it to maxResults.