Hello, I was trying to use YarnMiniCluster in some of my test cases, but ran into some problems. From YARN-129, it seems the classpath of all Yarn attempts should be set to the java classpath when executing YARNRunner, but it doesn't seem to be the case. I had consistently found the following error in my attempt logs:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/yarn/service/CompositeService at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.yarn.service.CompositeService at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ... 12 more Could not find the main class: org.apache.hadoop.mapreduce.v2.app.MRAppMaster. Program will exit. The work around was to change "yarn.application.classpath". For my purposes, setting "Yarn.application.classpath" seems fine. In the case where I have an MR job that uses a JAR file in distributed cache, then the attempt will definitely fail. Any thoughts on how this should be addressed? -Abe
