svn merge -c 1334603 from trunk. Backport of HADOOP-8323. Reverts HADOOP-7940

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1334606 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -197,8 +197,6 @@ Release 2.0.0 - UNRELEASED
 
     HADOOP-8104. Inconsistent Jackson versions (tucu)
 
-    HADOOP-7940. The Text.clear() method does not clear the bytes as intended. (Csaba Miklos via harsh)
-
     HADOOP-8119. Fix javac warnings in TestAuthenticationFilter in hadoop-auth.
     (szetszwo)
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/Text.java

@@ -239,7 +239,6 @@ public class Text extends BinaryComparable
    */
   public void clear() {
     length = 0;
-    bytes = EMPTY_BYTES;
   }
 
   /*

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/TestText.java

@@ -192,16 +192,6 @@ public class TestText extends TestCase {
     assertTrue(text.find("\u20ac", 5)==11);
   }
 
-  public void testClear() {
-	Text text = new Text();
-	assertEquals("", text.toString());
-	assertEquals(0, text.getBytes().length);
-	text = new Text("abcd\u20acbdcd\u20ac");
-	text.clear();
-	assertEquals("", text.toString());
-	assertEquals(0, text.getBytes().length);
-  }
-
   public void testFindAfterUpdatingContents() throws Exception {
     Text text = new Text("abcd");
     text.set("a".getBytes());