How to use

TestTaskCommit$CommitterWithCommitFail

in

org.apache.hadoop.mapred

 public void commitTask(TaskAttemptContext context) throws IOException {
  Path taskOutputPath = getTempTaskOutputPath(context);
  TaskAttemptID attemptId = context.getTaskAttemptID();
  JobConf job = context.getJobConf();
  if (taskOutputPath != null) {
   FileSystem fs = taskOutputPath.getFileSystem(job);
   if (fs.exists(taskOutputPath)) {
    throw new IOException();
   }
  }
 }
}

 public void commitTask(TaskAttemptContext context) throws IOException {
  Path taskOutputPath = getTaskAttemptPath(context);
  TaskAttemptID attemptId = context.getTaskAttemptID();
  JobConf job = context.getJobConf();
  if (taskOutputPath != null) {
   FileSystem fs = taskOutputPath.getFileSystem(job);
   if (fs.exists(taskOutputPath)) {
    throw new IOException();
   }
  }
 }
}