[SPY-317] Backports of SPARK-1582, SPARK-1601 and SPARK-1602#6

Merged

jhartlaub merged 3 commits intoalteryx:master-csdfrom

markhamstra:SPY-317

Apr 24, 2014

Commits on Apr 24, 2014

SPARK-1601 & SPARK-1602: two bug fixes related to cancellation

rxin
authored and
markhamstra
committed
SPARK-1582 Invoke Thread.interrupt() when cancelling jobs

aarondav
authored and
markhamstra
committed
Changes to accommodate backporting of SPARK-1582, SPARK-1601 and SPARK-1602
markhamstra
committed