private static void sequentialTest(FileSystem fs, int testType, int fileSize, int nrFiles) throws Exception { IOStatMapper ioer = null; if (testType == TEST_TYPE_READ) ioer = new ReadMapper(); else if (testType == TEST_TYPE_WRITE) ioer = new WriteMapper(); else return; for (int i = 0; i < nrFiles; i++) ioer.doIO(Reporter.NULL, BASE_FILE_NAME + Integer.toString(i), MEGA * fileSize); }