// The new APIs on MapReduceContext will simply be:

/**
 * Updates the input configuration of this MapReduce job to use the specified {@link Input}.
 * @param input the input to be used
 */
void addInput(Input input);

/**
 * Updates the input configuration of this MapReduce job to use the specified {@link Input}.
 * @param input the input to be used
 * @param mapperCls the mapper class to be used for the input
 */
void addInput(Input input, Class<?> mapperClassmapperCls);