MAPREDUCE-7052. TestFixedLengthInputFormat#testFormatCompressedIn is flaky. Contributed by Peter Bacsko

(cherry picked from commit a53d62ab26e170a0338f93e228718da52e9196e4)

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestFixedLengthInputFormat.java

@@ -300,7 +300,7 @@ public class TestFixedLengthInputFormat {
       if (i > 0) {
         if (i == (MAX_TESTS-1)) {
           // Test a split size that is less than record len
-          numSplits = (int)(fileSize/Math.floor(recordLength/2));
+          numSplits = (int)(fileSize/ Math.max(1, Math.floor(recordLength/2)));
         } else {
           if (MAX_TESTS % i == 0) {
             // Let us create a split size that is forced to be