We are running spark streaming to get the feed from Kafka. Now we are trying to use Phoenix JDBC to extract some data from HBASE. When I run the code in local its running fine without any issues, but when I run it using yarn-cluster it throws below exception. Using CDH 5.4.4.   Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.ipc.controller.ClientRpcControllerFactory     at java.net.URLClassLoader$1.run(URLClassLoader.java:366)     at java.net.URLClassLoader$1.run(URLClassLoader.java:355)     at java.security.AccessController.doPrivileged(Native Method)     at java.net.URLClassLoader.findClass(URLClassLoader.java:354)     at java.lang.ClassLoader.loadClass(ClassLoader.java:425)     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)     at java.lang.ClassLoader.loadClass(ClassLoader.java:358)     at java.lang.Class.forName0(Native Method)     at java.lang.Class.forName(Class.java:190)   Below is the code snippet:   def check(arg0:String,arg1:String) {   val query = "query"         Class.forName("org.apache.phoenix.jdbc.PhoenixDriver");     var conn =  DriverManager.getConnection("jdbc:phoenix:IP:zkport:/znode");         val statement = conn.createStatement()         val resultSet = statement.executeQuery(query)         var out="";         while(resultSet.next())         {           out=resultSet.getString("..")         } }   And the SBT dependency added is   libraryDependencies += "org.apache.phoenix" % "phoenix-core" % "4.5.2-cdh5.4.5"   I manually checked for the missing class, and it is there in phoenix-core jar. What is the reason behind yarn/spark throwing an exception. I tried adding it as a separate classpath that doesn't work either. Any workaround for this.   ... View more