YARN-3786. Document yarn class path options. Contributed by Brahma Reddy Battula.

(cherry picked from commit a531b058aef48c9bf2e5366ed110e1f817316c1a)

hadoop-yarn-project/CHANGES.txt

@@ -249,6 +249,9 @@ Release 2.8.0 - UNRELEASED
     YARN-2716. Refactor ZKRMStateStore retry code with Apache Curator. 
     (Karthik Kambatla via jianhe)
 
+    YARN-3786. Document yarn class path options.
+    (Brahma Reddy Battula via cnauroth)
+
   OPTIMIZATIONS
 
     YARN-3339. TestDockerContainerExecutor should pull a single image and not

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/YarnCommands.md

@@ -85,9 +85,15 @@ prints applicationattempt(s) report
 
 ### `classpath`
 
-Usage: `yarn classpath`
+Usage: `yarn classpath [--glob |--jar <path> |-h |--help]`
 
-Prints the class path needed to get the Hadoop jar and the required libraries
+| COMMAND\_OPTION | Description |
+|:---- |:---- |
+| `--glob` | expand wildcards |
+| `--jar` *path* | write classpath as manifest in jar named *path* |
+| `-h`, `--help` | print help |
+
+Prints the class path needed to get the Hadoop jar and the required libraries. If called without arguments, then prints the classpath set up by the command scripts, which is likely to contain wildcards in the classpath entries. Additional options print the classpath after wildcard expansion or write the classpath into the manifest of a jar file. The latter is useful in environments where wildcards cannot be used and the expanded classpath exceeds the maximum supported command line length.
 
 ### `container`