org.apache.hadoop.mapred.join

Interface ComposableInputFormat<K extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable>

All Superinterfaces:

InputFormat<K,V>

All Known Implementing Classes:

CompositeInputFormat, Parser.Node

@InterfaceAudience.Public
@InterfaceStability.Stable
public interface ComposableInputFormat<K extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable>
extends InputFormat<K,V>

Refinement of InputFormat requiring implementors to provide ComposableRecordReader instead of RecordReader.

Method Summary

Methods

Modifier and Type	Method and Description
ComposableRecordReader<K,V>	getRecordReader(InputSplit split, JobConf job, Reporter reporter) Get the RecordReader for the given InputSplit.

Methods inherited from interface org.apache.hadoop.mapred.InputFormat

getSplits

Method Detail

getRecordReader

ComposableRecordReader<K,V> getRecordReader(InputSplit split,
                                          JobConf job,
                                          Reporter reporter)
                                                                                                                                  throws IOException

Description copied from interface: InputFormat

Get the RecordReader for the given InputSplit.

It is the responsibility of the RecordReader to respect record boundaries while processing the logical split to present a record-oriented view to the individual task.

Specified by:

getRecordReader in interface InputFormat<K extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable>

Parameters:

split - the InputSplit

job - the job that this split belongs to

Returns:

a RecordReader

Throws:

IOException