Initial commit for Ray streaming (#4268)

java/streaming/src/main/resources/log4j.properties

@@ -0,0 +1,6 @@
+log4j.rootLogger=INFO, stdout
+# Direct log messages to stdout
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.Target=System.out
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

java/streaming/src/main/resources/ray.conf

@@ -0,0 +1,5 @@
+ray {
+  run-mode = SINGLE_PROCESS
+  resources = "CPU:4,GPU:0"
+  redis.address = ""
+}