update spark version to 2.3.0

[elmiko]

the radanalytics.io tooling is now deploying 2.3.0 as the default
version. this change will ensure that the example continues to work with
the upstream changes.

[elmiko]

we would like to update the spark version for the radanalytics tooling, but when we try to redeploy the application with this change we are seeing the following output:

spark-submit --class com.redhat.iot.spark.AMQPTemperature --master spark://mycluster:7077 --conf spark.driver.host=sparkdriver-headless /opt/app-root/src/amqp-spark-driver-1.0-SNAPSHOT.jar artemis.zroubali.svc 5672
18/08/06 13:58:19 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Exception in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
	at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:330)
	at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:263)
	at java.util.jar.JarVerifier.processEntry(JarVerifier.java:318)
	at java.util.jar.JarVerifier.update(JarVerifier.java:230)
	at java.util.jar.JarFile.initializeVerifier(JarFile.java:383)
	at java.util.jar.JarFile.getInputStream(JarFile.java:450)
	at sun.misc.URLClassPath$JarLoader$2.getInputStream(URLClassPath.java:977)
	at sun.misc.Resource.cachedInputStream(Resource.java:77)
	at sun.misc.Resource.getByteBuffer(Resource.java:160)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:454)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.apache.spark.util.Utils$.classForName(Utils.scala:235)
	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:836)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:197)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:227)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:136)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
18/08/06 13:58:20 INFO ShutdownHookManager: Shutdown hook called

[elmiko]

this pr addresses issue #2

[ppatierno]

@elmiko sorry to be really late on this! Did you try the demo with the new Spark version? If it works fine, I can merge this one.

[elmiko]

hi @ppatierno , yes i did test with that new pr. we could probably even bump that to 2.3.1, but i know this works for now.

[ppatierno]

@elmiko ok so let me just merge this one for now, thanks!

[ppatierno]

LGTM. Thanks!