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:

Writable

Direct Known Subclasses:

DataDrivenDBInputFormat.DataDrivenDBInputSplit

Enclosing class:

DBInputFormat<T extends DBWritable>

@InterfaceStability.Evolving
public static class DBInputFormat.DBInputSplit
extends InputSplit
implements Writable

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 size of the split, so that the input splits can be sorted by size.
String[]	getLocations() Get the list of nodes by name where the data for the split would be local.
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 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:

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 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:

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