MAPREDUCE-5274. Bring back SecureShuffleUtils.toHex in mapreduce for binary compatibility with 1.x APIs. Contributed by Mayank Bansal.

svn merge --ignore-ancestry -c 1488625 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1488626 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -136,6 +136,9 @@ Release 2.1.0-beta - UNRELEASED
     MAPREDUCE-5229. Put back FileOutputCommitter.TEMP_DIR_NAME in mapreduce for
     binary compatibility with 1.x APIs. (Zhijie Shen via vinodkv)
 
+    MAPREDUCE-5274. Bring back SecureShuffleUtils.toHex in mapreduce for binary
+    compatibility with 1.x APIs. (Mayank Bansal via vinodkv)
+
   OPTIMIZATIONS
 
     MAPREDUCE-4974. Optimising the LineRecordReader initialize() method 

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/security/SecureShuffleUtils.java

@@ -132,4 +132,19 @@ public class SecureShuffleUtils {
   private static String buildMsgFrom(String uri_path, String uri_query, int port) {
     return String.valueOf(port) + uri_path + "?" + uri_query;
   }
+
+  /**
+   * byte array to Hex String
+   * 
+   * @param ba
+   * @return string with HEX value of the key
+   */
+  public static String toHex(byte[] ba) {
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    PrintStream ps = new PrintStream(baos);
+    for (byte b : ba) {
+      ps.printf("%x", b);
+    }
+    return baos.toString();
+  }
 }