org.apache.hadoop.mapreduce.lib.db

Class DataDrivenDBInputFormat.DataDrivenDBInputSplit

java.lang.Object

org.apache.hadoop.mapreduce.InputSplit

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

org.apache.hadoop.mapreduce.lib.db.DataDrivenDBInputFormat.DataDrivenDBInputSplit

All Implemented Interfaces:

Writable

Enclosing class:

DataDrivenDBInputFormat<T extends DBWritable>

@InterfaceStability.Evolving
public static class DataDrivenDBInputFormat.DataDrivenDBInputSplit
extends DBInputFormat.DBInputSplit

A InputSplit that spans a set of rows

Constructor Summary

Constructors

Constructor and Description
DataDrivenDBInputFormat.DataDrivenDBInputSplit() Default Constructor
DataDrivenDBInputFormat.DataDrivenDBInputSplit(String lower, String upper) Convenience Constructor

Method Summary

Methods

Modifier and Type	Method and Description
long	getLength() Get the size of the split, so that the input splits can be sorted by size.
String	getLowerClause()
String	getUpperClause()
void	readFields(DataInput input) Deserialize the fields of this object from in.
void	write(DataOutput output) Serialize the fields of this object to out.

Methods inherited from class org.apache.hadoop.mapreduce.lib.db.DBInputFormat.DBInputSplit

getEnd, getLocations, getStart

Methods inherited from class java.lang.Object

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

Constructor Detail

DataDrivenDBInputFormat.DataDrivenDBInputSplit

public DataDrivenDBInputFormat.DataDrivenDBInputSplit()

Default Constructor

DataDrivenDBInputFormat.DataDrivenDBInputSplit

public DataDrivenDBInputFormat.DataDrivenDBInputSplit(String lower,
                                              String upper)

Convenience Constructor

Parameters:

lower - the string to be put in the WHERE clause to guard on the 'lower' end

upper - the string to be put in the WHERE clause to guard on the 'upper' end

Method Detail

getLength

public long getLength()
               throws IOException

Description copied from class: InputSplit

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

Overrides:

getLength in class DBInputFormat.DBInputSplit

Returns:

The total row count in this split

Throws:

IOException

readFields

public void readFields(DataInput input)
                throws IOException

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

Specified by:

readFields in interface Writable

Overrides:

readFields in class DBInputFormat.DBInputSplit

Parameters:

input - DataInput to deseriablize this object from.

Throws:

IOException

write

public void write(DataOutput output)
           throws IOException

Serialize the fields of this object to out.

Specified by:

write in interface Writable

Overrides:

write in class DBInputFormat.DBInputSplit

Parameters:

output - DataOuput to serialize this object into.

Throws:

IOException

getLowerClause

public String getLowerClause()

getUpperClause

public String getUpperClause()