io.dstream.tez.io

Class KeyWritable

java.lang.Object

io.dstream.tez.io.TypeAwareWritable<java.lang.Object>

io.dstream.tez.io.KeyWritable

All Implemented Interfaces:

NewWritable<java.lang.Object>, java.io.Serializable, java.lang.Comparable<KeyWritable>, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable<KeyWritable>

public class KeyWritable
extends TypeAwareWritable<java.lang.Object>
implements org.apache.hadoop.io.WritableComparable<KeyWritable>, java.io.Serializable

This class represents a universal Writable with the goal of recognizing and properly writing/reading multiple types of data. More documentation to follow as its design progresses, but at the moment the mechanism is simple: 1. Prepend each value with a byte representing its type 2. Write value data as byte[] For fixed formats such as Int, Long etc., its standard byte representation is used (e.g., Int = 4 bytes) For Objects (variable length) object serialization is used with custom se/deser to be exposed for customization and optimization This class is not public nor it is meant/designed as thread-safe.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface io.dstream.tez.io.NewWritable

NewWritable.NewIntWritable, NewWritable.NewLongWritable, NewWritable.NewTextWritable

Field Summary

Fields inherited from class io.dstream.tez.io.TypeAwareWritable

value

Constructor Summary

Constructors

Constructor and Description
KeyWritable()

Method Summary

Modifier and Type	Method and Description
int	compareTo(KeyWritable o)
protected static void	setAscending(boolean ascending)
void	setValue(java.lang.Object value)

Methods inherited from class io.dstream.tez.io.TypeAwareWritable

getValue, hashCode, readFields, toString, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.io.Writable

readFields, write

Constructor Detail

KeyWritable

public KeyWritable()

Method Detail

setValue

public void setValue(java.lang.Object value)

Specified by:

setValue in interface NewWritable<java.lang.Object>

Overrides:

setValue in class TypeAwareWritable<java.lang.Object>

compareTo

public int compareTo(KeyWritable o)

Specified by:

compareTo in interface java.lang.Comparable<KeyWritable>

setAscending

protected static void setAscending(boolean ascending)

Parameters:

ascending -