MAPREDUCE-6676. NNBench should Throw IOException when rename and delete fails. Contributed by Brahma Reddy Battula.

(cherry picked from commit 24181f559f008fc7945702c0fad7d1028f75bfc6)

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/hdfs/NNBench.java

@@ -868,7 +868,10 @@ public class NNBench extends Configured implements Tool {
           try {
             // Set up timer for measuring AL
             startTimeAL = System.currentTimeMillis();
-            filesystem.rename(filePath, filePathR);
+            boolean result = filesystem.rename(filePath, filePathR);
+            if (!result) {
+              throw new IOException("rename failed for " + filePath);
+            }
             totalTimeAL1 += (System.currentTimeMillis() - startTimeAL);
             
             successfulOp = true;
@@ -901,7 +904,10 @@ public class NNBench extends Configured implements Tool {
           try {
             // Set up timer for measuring AL
             startTimeAL = System.currentTimeMillis();
-            filesystem.delete(filePath, true);
+            boolean result = filesystem.delete(filePath, true);
+            if (!result) {
+              throw new IOException("delete failed for " + filePath);
+            }
             totalTimeAL1 += (System.currentTimeMillis() - startTimeAL);
             
             successfulOp = true;