YARN-3015. yarn classpath command should support same options as hadoop classpath. Contributed by Varun Saxena.

hadoop-yarn-project/CHANGES.txt

@@ -388,6 +388,9 @@ Release 2.7.0 - UNRELEASED
     YARN-3070. TestRMAdminCLI#testHelp fails for transitionToActive command. 
     (Contributed by Junping Du)
 
+    YARN-3015. yarn classpath command should support same options as hadoop
+    classpath. (Contributed by Varun Saxena)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/bin/yarn

@@ -81,9 +81,7 @@ case "${COMMAND}" in
     set -- "${COMMAND}" "$@"
   ;;
   classpath)
-    hadoop_finalize
-    echo "${CLASSPATH}"
-    exit
+    hadoop_do_classpath_subcommand "$@"
   ;;
   daemonlog)
     CLASS=org.apache.hadoop.log.LogLevel

hadoop-yarn-project/hadoop-yarn/bin/yarn.cmd

@@ -142,13 +142,16 @@ if "%1" == "--loglevel" (
   set CLASSPATH=%CLASSPATH%;%HADOOP_YARN_HOME%\%YARN_LIB_JARS_DIR%\*
 
   if %yarn-command% == classpath (
+    if not defined yarn-command-arguments (
+      @rem No need to bother starting up a JVM for this simple case.
       @echo %CLASSPATH%
-    goto :eof
+      exit /b
+    )
   )
 
   set yarncommands=resourcemanager nodemanager proxyserver rmadmin version jar ^
      application applicationattempt container node logs daemonlog historyserver ^
-     timelineserver
+     timelineserver classpath
   for %%i in ( %yarncommands% ) do (
     if %yarn-command% == %%i set yarncommand=true
   )
@@ -169,7 +172,7 @@ if "%1" == "--loglevel" (
 goto :eof
 
 :classpath
-  @echo %CLASSPATH%
+  set CLASS=org.apache.hadoop.util.Classpath
   goto :eof
 
 :rmadmin