Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/4964#issuecomment-81383011
@tdas - What do you think about adding a short-circuit for the scenario
when `concurrentJobs == 1`? That would basically combine the current state of
this PR with the simple approach in an earlier version of this PR:
https://github.com/harishreedharan/spark/commit/fa93b871ba0fe22924ff0273e975e492a6a7043c
This would avoid access the `synchronized` blocks when only one job can be
executed at a time.
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