Merge remote-tracking branch 'origin/master' into yarn-2.2

conf/metrics.properties.template

core/pom.xml

core/src/main/scala/org/apache/spark/SparkContext.scala

.../main/scala/org/apache/spark/api/java/JavaDoubleRDD.scala

...rc/main/scala/org/apache/spark/executor/TaskMetrics.scala

...in/scala/org/apache/spark/metrics/sink/GraphiteSink.scala

.../main/scala/org/apache/spark/rdd/DoubleRDDFunctions.scala

...rc/main/scala/org/apache/spark/rdd/MapPartitionsRDD.scala

core/src/main/scala/org/apache/spark/rdd/RDD.scala

...main/scala/org/apache/spark/rdd/ZippedPartitionsRDD.scala

...ain/scala/org/apache/spark/scheduler/ShuffleMapTask.scala

...in/scala/org/apache/spark/storage/BlockObjectWriter.scala

.../src/main/scala/org/apache/spark/util/AppendOnlyMap.scala

core/src/main/scala/org/apache/spark/util/Utils.scala

...src/main/scala/org/apache/spark/util/XORShiftRandom.scala

.../scala/org/apache/spark/util/collection/OpenHashSet.scala

core/src/test/scala/org/apache/spark/CheckpointSuite.scala

core/src/test/scala/org/apache/spark/JavaAPISuite.java

.../src/test/scala/org/apache/spark/rdd/DoubleRDDSuite.scala

...est/scala/org/apache/spark/util/XORShiftRandomSuite.scala