org.apache.hadoop.mapred.join
Class TupleWritable

java.lang.Object
  extended by org.apache.hadoop.mapreduce.lib.join.TupleWritable
      extended by org.apache.hadoop.mapred.join.TupleWritable
All Implemented Interfaces:
Iterable<Writable>, Writable

@InterfaceAudience.Public
@InterfaceStability.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
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
 

Constructor Detail

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.



Copyright © 2012 Apache Software Foundation. All Rights Reserved.