Conflicts:
	core/src/main/scala/spark/ui/UIUtils.scala
	core/src/main/scala/spark/ui/jobs/IndexPage.scala
	core/src/main/scala/spark/ui/storage/RDDPage.scala

Fixed issue in UI that decreased scheduler throughput by 5x or more

Removal of items from ArrayBuffers in the UI code was slow and
significantly impacted scheduler throughput. This commit
improves scheduler throughput by 5x.

Update the Python logistic regression example

SPARK-826: fold(), reduce(), collect() always attempt to use java serialization

Conflicts:
	core/src/main/resources/spark/ui/static/webui.css

Update spark-standalone.md

[HOTFIX] Extend thread safety for SparkEnv.get()

Simple PageRank algorithm implementation in Java for SPARK-760

SHARK-94 Log the files computed by HadoopRDD and NewHadoopRDD

SPARK-847 + SPARK-845: Zombie workers and negative cores

adding matrix factorization data generator

Show user-defined job name in UI

On branch adatao-global-SparkEnv
Changes to be committed:

	modified:   core/src/main/scala/spark/SparkEnv.scala

SPARK-850

A ThreadLocal SparkEnv.env is facing various situations leading to
NullPointerExceptions, where SparkEnv.env set in one thread is not
gettable in another thread, but often assumed to be available.

See, e.g., https://groups.google.com/forum/#!topic/spark-developers/GLx8yunSj0A

This hotfixes SparkEnv.env to return either (a) the ThreadLocal
value if non-null, or (b) the previously set value in any thread.

This approach preserves SparkEnv.set() thread safety needed by
RDD.compute() and possibly other places. A refactoring that
parameterizes SparkEnv should be addressed subsequently.

On branch adatao-global-SparkEnv
Changes to be committed:

	modified:   core/src/main/scala/spark/SparkEnv.scala