Raise exception when hashing Java arrays (SPARK-597)
Mark key as not loading in CacheTracker even when compute() fails
Test with exception while computing cached RDD.
Remove some dead comments
Merge pull request #348 from JoshRosen/spark-597

Raise exception when hashing Java arrays (SPARK-597)
Merge pull request #349 from woggling/cache-finally

Avoid stalls when computation of cached RDD throws exception
Merge branch 'master' of https://github.com/mesos/spark