Merge branch 'support-worker_dir' into start_workerui_on_public_addr
Merge branch 'start_workerui_on_public_addr'
Merge branch 'master' of https://github.com/CodingCat/incubator-spark
Merge branch 'master' of https://github.com/CodingCat/incubator-spark
Merge branch 'master' of https://github.com/CodingCat/incubator-spark
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Updated java API docs for streaming, along with very minor changes in the code examples.
Only log error on missing jar to allow spark examples to jar.
update comment
executor creation failed should not make the worker restart
fix for SPARK-1027

change TestClient & Worker to Some("xxx")

kill manager if it is started

remove unnecessary .get when fetch "SPARK_HOME" values
Merge branch 'SPARK-1027' of https://github.com/CodingCat/incubator-spark into SPARK-1027