Matthias Boehm created SYSTEMML-2175:

             Summary: Parfor spark fair scheduler pool leak
                 Key: SYSTEMML-2175
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm

In an algorithm with an overall convergence loop and a parfor loop over large 
data in each outer iteration, we encountered a leak of parfor fair scheduler 
pools. Specifically, this issue seems to arise whenever the parfor loop has 
fewer iterations and thus workers than locally available threads.

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