MAPREDUCE-4414. Add main methods to JobConf and YarnConfiguration, for debug purposes. Contributed by Plamen Jeliazkov.

(cherry picked from commit 571f75b468a4412be2178466cb5d3888b05cd076)

hadoop-mapreduce-project/CHANGES.txt

@@ -8,6 +8,9 @@ Release 2.8.0 - UNRELEASED
 
   IMPROVEMENTS
 
+    MAPREDUCE-4414. Add main methods to JobConf and YarnConfiguration,
+    for debug purposes. (Plamen Jeliazkov via harsh)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JobConf.java

@@ -2021,5 +2021,10 @@ public class JobConf extends Configuration {
   }
   
 
+  /* For debugging. Dump configurations to system output as XML format. */
+  public static void main(String[] args) throws Exception {
+    new JobConf(new Configuration()).writeXml(System.out);
+  }
+
 }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java

@@ -1808,4 +1808,9 @@ public class YarnConfiguration extends Configuration {
     }
     return clusterId;
   }
+
+  /* For debugging. mp configurations to system output as XML format. */
+  public static void main(String[] args) throws Exception {
+    new YarnConfiguration(new Configuration()).writeXml(System.out);
+  }
 }