org.apache.hadoop.mapreduce.lib.db

Class DBInputFormat.DBInputSplit

java.lang.Object

org.apache.hadoop.mapreduce.InputSplit

org.apache.hadoop.mapreduce.lib.db.DBInputFormat.DBInputSplit

All Implemented Interfaces:

org.apache.hadoop.io.Writable

Direct Known Subclasses:

DataDrivenDBInputFormat.DataDrivenDBInputSplit, DBInputFormat.DBInputSplit

Enclosing class:

DBInputFormat<T extends DBWritable>

public static class DBInputFormat.DBInputSplit
extends InputSplit
implements org.apache.hadoop.io.Writable

A InputSplit that spans a set of rows

Constructor Summary

Constructors

Constructor and Description
DBInputFormat.DBInputSplit() Default Constructor
DBInputFormat.DBInputSplit(long start, long end) Convenience Constructor

Method Summary

Methods

Modifier and Type	Method and Description
long	getEnd()
long	getLength() Get the size of the split, so that the input splits can be sorted by size.
java.lang.String[]	getLocations() Get the list of nodes by name where the data for the split would be local.
long	getStart()
void	readFields(java.io.DataInput input)
void	write(java.io.DataOutput output)

Methods inherited from class java.lang.Object

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

Constructor Detail

DBInputFormat.DBInputSplit

public DBInputFormat.DBInputSplit()

Default Constructor

DBInputFormat.DBInputSplit

public DBInputFormat.DBInputSplit(long start,
                          long end)

Convenience Constructor

Parameters:

start - the index of the first row to select

end - the index of the last row to select

Method Detail

getLocations

public java.lang.String[] getLocations()
                                throws java.io.IOException

Get the list of nodes by name where the data for the split would be local. The locations do not need to be serialized.

Specified by:

getLocations in class InputSplit

Returns:

a new array of the node nodes.

Throws:

java.io.IOException

getStart

public long getStart()

Returns:

The index of the first row to select

getEnd

public long getEnd()

Returns:

The index of the last row to select

getLength

public long getLength()
               throws java.io.IOException

Description copied from class: InputSplit

Get the size of the split, so that the input splits can be sorted by size.

Specified by:

getLength in class InputSplit

Returns:

The total row count in this split

Throws:

java.io.IOException

readFields

public void readFields(java.io.DataInput input)
                throws java.io.IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

java.io.IOException

write

public void write(java.io.DataOutput output)
           throws java.io.IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

java.io.IOException