MAPREDUCE-3283. mapred classpath CLI does not display the complete classpath. Contributed by Varun Saxena.

hadoop-mapreduce-project/CHANGES.txt

@@ -307,6 +307,9 @@ Release 2.7.0 - UNRELEASED
     MAPREDUCE-6206. TestAggregatedTransferRate fails on non-US systems (Jens
     Rabe via jlowe)
 
+    MAPREDUCE-3283. mapred classpath CLI does not display the complete classpath
+    (Varun Saxena via cnauroth)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/bin/mapred

@@ -78,9 +78,7 @@ case ${COMMAND} in
     HADOOP_OPTS="${HADOOP_OPTS} ${HADOOP_CLIENT_OPTS}"
   ;;
   classpath)
-    hadoop_finalize
-    echo "${CLASSPATH}"
-    exit 0
+    hadoop_do_classpath_subcommand "$@" 
   ;;
   distcp)
     CLASS=org.apache.hadoop.tools.DistCp

hadoop-mapreduce-project/bin/mapred.cmd

@@ -95,6 +95,14 @@ if "%1" == "--loglevel" (
   @rem add modules to CLASSPATH
   set CLASSPATH=%CLASSPATH%;%HADOOP_MAPRED_HOME%\modules\*
 
+  if %mapred-command% == classpath (
+    if not defined mapred-command-arguments (
+      @rem No need to bother starting up a JVM for this simple case.
+      @echo %CLASSPATH%
+      exit /b
+    )
+  )
+
   call :%mapred-command% %mapred-command-arguments%
   set java_arguments=%JAVA_HEAP_MAX% %HADOOP_OPTS% -classpath %CLASSPATH% %CLASS% %mapred-command-arguments%
   call %JAVA% %java_arguments%
@@ -103,7 +111,7 @@ goto :eof
 
 
 :classpath
-  @echo %CLASSPATH%
+  set CLASS=org.apache.hadoop.util.Classpath
   goto :eof
 
 :job