Merge HDFS-5544. Adding Test case For Checking dfs.checksum.type as NULL value. Contributed by Sathish.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.2@1544599 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -21,6 +21,8 @@ Release 2.2.1 - UNRELEASED
 
     HDFS-5344. Make LsSnapshottableDir as Tool interface implementation. (Sathish via umamahesh)
 
+    HDFS-5544. Adding Test case For Checking dfs.checksum type as NULL value. (Sathish via umamahesh)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFSOutputSummer.java

@@ -135,4 +135,25 @@ public class TestFSOutputSummer {
       cluster.shutdown();
     }
   }
+  
+  @Test
+  public void TestDFSCheckSumType() throws Exception{
+    Configuration conf = new HdfsConfiguration();
+    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCK_SIZE);
+    conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, BYTES_PER_CHECKSUM);
+    conf.set(DFSConfigKeys.DFS_CHECKSUM_TYPE_KEY, "NULL");
+    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
+                                               .numDataNodes(NUM_OF_DATANODES)
+                                               .build();
+    fileSys = cluster.getFileSystem();
+    try {
+      Path file = new Path("try.dat");
+      Random rand = new Random(seed);
+      rand.nextBytes(expected);
+      writeFile1(file);
+    } finally {
+      fileSys.close();
+      cluster.shutdown();
+    }
+  }
 }