org.apache.mahout.clustering.spectral

Class VectorCache

java.lang.Object

org.apache.mahout.clustering.spectral.VectorCache

public final class VectorCache
extends Object

This class handles reading and writing vectors to the Hadoop distributed cache. Created as a result of Eigencuts' liberal use of such functionality, but available to any algorithm requiring it.

Method Summary

Modifier and Type	Method and Description
static Vector	load(org.apache.hadoop.conf.Configuration conf) Loads the vector from DistributedCache.
static Vector	load(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.Path input) Loads a Vector from the specified path.
static void	save(org.apache.hadoop.io.Writable key, Vector vector, org.apache.hadoop.fs.Path output, org.apache.hadoop.conf.Configuration conf) Calls the save() method, setting the cache to overwrite any previous Path and to delete the path after exiting
static void	save(org.apache.hadoop.io.Writable key, Vector vector, org.apache.hadoop.fs.Path output, org.apache.hadoop.conf.Configuration conf, boolean overwritePath, boolean deleteOnExit)

Methods inherited from class java.lang.Object

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

Method Detail

save

public static void save(org.apache.hadoop.io.Writable key,
                        Vector vector,
                        org.apache.hadoop.fs.Path output,
                        org.apache.hadoop.conf.Configuration conf,
                        boolean overwritePath,
                        boolean deleteOnExit)
                 throws IOException

Parameters:

key - SequenceFile key

vector - Vector to save, to be wrapped as VectorWritable

Throws:

IOException

save

public static void save(org.apache.hadoop.io.Writable key,
                        Vector vector,
                        org.apache.hadoop.fs.Path output,
                        org.apache.hadoop.conf.Configuration conf)
                 throws IOException

Calls the save() method, setting the cache to overwrite any previous Path and to delete the path after exiting

Throws:

IOException

load

public static Vector load(org.apache.hadoop.conf.Configuration conf)
                   throws IOException

Loads the vector from DistributedCache. Returns null if no vector exists.

Throws:

IOException

load

public static Vector load(org.apache.hadoop.conf.Configuration conf,
                          org.apache.hadoop.fs.Path input)
                   throws IOException

Loads a Vector from the specified path. Returns null if no vector exists.

Throws:

IOException