More Details about Input Format and Output Format

Note:
1. "Key" means you can take any Hadoop WritableComparable Class

2. "Value" means you can take any Hadoop Writable Class

Input Format Class	Record Reader Class	Key Class	Value Class
TextInputFormat	LineRecordReader	LongWritable	Text
KeyValueTextInputFormat	KeyValueLineRecordReader	Text	Text
NLineInputFormat	LineRecordReader	LongWritable	Text
DBInputFormat	DBRecordReader	LongWritable	Value extends DBWritable
CombineTextInputFormat	CombineFileRecordReader	LongWritable	Text
CombineSequenceFileInputFormat	CombineFileRecordReader	Key	Value
DelegatingInputFormat	DelegatingRecordReader	Key	Value
FixedLengthInputFormat	FixedLengthRecordReader	LongWritable	LongWritable
SequenceFileInputFormat	SequenceFileRecordReader	Key	Value
SequenceFileAsBinaryInputFormat	SequenceFileAsBinaryRecordReader	BytesWritable	BytesWritable
SequenceFileAsTextInputFormat	SequenceFileAsTextRecordReader	Text	Text
Output Format Class	Record Writer Class	Key Class	Value Class
TextOutputFormat	LineRecordWriter	Key	Value
SequenceFileOutputFormat	RecordWriter	Key	Value
SequenceFileAsBinaryOutputFormat	RecordWriter	BytesWritable	BytesWritable
DBOutputFormat	DBRecordWriter	Key extends DBWritable	Value
LazyOutputFormat	LazyRecordWriter	Key	Value
FilterOutputFormat	FilterRecordWriter	Key	Value
NullOutputFormat	RecordWriter	Key	Value