Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5704#issuecomment-97169734
In other words, there seems to be two separate issues here:
(1) SPARK-6954 - we throw an exception for requesting negative target
sometimes, and
(2) (No JIRA yet) - cancel is too closely intertwined with add
I believe there are still disagreements out there about whether (2) is
actually an issue. This patch fixes (1) and cleans up some code. After the 1.4
release I would like to at least continue the discussion on (2).
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