org.apache.hadoop.mapred.lib.db
Class DBInputFormat.DBInputSplit

java.lang.Object
  org.apache.hadoop.mapred.lib.db.DBInputFormat.DBInputSplit

All Implemented Interfaces:

Writable, InputSplit

Enclosing class:

DBInputFormat<T extends DBWritable>

protected static class DBInputFormat.DBInputSplit
extends Object
implements InputSplit

A InputSplit that spans a set of rows

Constructor Summary

DBInputFormat.DBInputSplit()
Default Constructor

DBInputFormat.DBInputSplit(long start, long end)
Convenience Constructor

Method Summary

long	getEnd()
long	getLength() Get the total number of bytes in the data of the InputSplit.
String[]	getLocations() Get the list of hostnames where the input split is located.
long	getStart()
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 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 String[] getLocations()
                      throws IOException

Get the list of hostnames where the input split is located.

Specified by:

getLocations in interface InputSplit

Returns:

list of hostnames where data of the InputSplit is located as an array of Strings.

Throws:

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 IOException

Description copied from interface: InputSplit

Get the total number of bytes in the data of the InputSplit.

Specified by:

getLength in interface InputSplit

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

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

Parameters:

output - DataOuput to serialize this object into.

Throws:

IOException