Merge HADOOP-9114. After defined the dfs.checksum.type as the NULL, write file and hflush will through java.lang.ArrayIndexOutOfBoundsException. Contributed by Sathish.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.2@1544192 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -58,6 +58,9 @@ Release 2.2.1 - UNRELEASED
     HADOOP-10110. hadoop-auth has a build break due to missing dependency.
     (Chuan Liu via arp)
 
+    HADOOP-9114. After defined the dfs.checksum.type as the NULL, write file and hflush will 
+    through java.lang.ArrayIndexOutOfBoundsException (Sathish via umamahesh)
+
 Release 2.2.0 - 2013-10-13
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSOutputSummer.java

@@ -183,10 +183,13 @@ abstract public class FSOutputSummer extends OutputStream {
   }
 
   static byte[] int2byte(int integer, byte[] bytes) {
-    bytes[0] = (byte)((integer >>> 24) & 0xFF);
-    bytes[1] = (byte)((integer >>> 16) & 0xFF);
-    bytes[2] = (byte)((integer >>>  8) & 0xFF);
-    bytes[3] = (byte)((integer >>>  0) & 0xFF);
+    if (bytes.length != 0) {
+      bytes[0] = (byte) ((integer >>> 24) & 0xFF);
+      bytes[1] = (byte) ((integer >>> 16) & 0xFF);
+      bytes[2] = (byte) ((integer >>> 8) & 0xFF);
+      bytes[3] = (byte) ((integer >>> 0) & 0xFF);
+      return bytes;
+    }
     return bytes;
   }