Package org.apache.hadoop.mapred.join

Class TupleWritable

java.lang.Object

org.apache.hadoop.mapreduce.lib.join.TupleWritable

org.apache.hadoop.mapred.join.TupleWritable

All Implemented Interfaces:

Iterable<Writable>, Writable

@Public
@Stable
public class TupleWritable
extends TupleWritable

Writable type storing multiple Writables. This is *not* a general-purpose tuple type. In almost all cases, users are encouraged to implement their own serializable types, which can perform better validation and provide more efficient encodings than this class is capable. TupleWritable relies on the join framework for type safety and assumes its instances will rarely be persisted, assumptions not only incompatible with, but contrary to the general case.

See Also:

• Writable

Field Summary

Fields inherited from class org.apache.hadoop.mapreduce.lib.join.TupleWritable

written

Constructor Summary

Constructors

Constructor	Description
TupleWritable()	Create an empty tuple with no allocated storage for writables.
TupleWritable(Writable[] vals)	Initialize tuple with storage; unknown whether any of them contain "written" values.

Method Summary

Methods inherited from class org.apache.hadoop.mapreduce.lib.join.TupleWritable

equals, get, has, hashCode, iterator, readFields, size, toString, write

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Details

TupleWritable

public TupleWritable()

Create an empty tuple with no allocated storage for writables.

TupleWritable

public TupleWritable(Writable[] vals)

Initialize tuple with storage; unknown whether any of them contain "written" values.