Java client for submitting a remote job to HDInsight Spark cluster.

The client supports to send a batch job and create an interactive session with Spark. The implmentation is based on the specification described in the following documents:

• HDInsight Remote Job Submission for Spark REST API Reference (https://msdn.microsoft.com/en-us/library/azure/mt613023.aspx)
• hdinsight/livy (https://github.com/hdinsight/livy)

You will need to download and install the following to build the code:

• JDK 1.8 or later
• Maven 3.x

TBD.

The sample codes are included in the src/main/java/sample directory. The sample shows you how to use the client for both batch and interactive.

Here is how to run the sample application, assuming you already have installed Java 8+ and Maven 3.x in your environment.

1. First of all, you need to set a username, password, and endpoint to get an access to your 
   hdinsight cluster. Open InteractiveSample2.java that is in src/main/java/sample directory, 
   and set username, password, and endpoint name to LivyInteractiveClient() class.
2. Change the directory to hdinsight-spark-livy-client/livy-client. You can find pom.xml, and 
   run the follwoiong command for compiling and building jar file.
   >mvn clean package -DskipTests=true
3. Run the application with the following command.
   >java -cp ./target/livy-client-0.0.1-SNAPSHOT.jar sample/Main