org.apache.nutch.ndfs
Class NDFS.NameNode

java.lang.Object
  org.apache.nutch.ipc.Server
      org.apache.nutch.ndfs.NDFS.NameNode

Enclosing class:

NDFS

public static class NDFS.NameNode

extends Server

NameNode controls two critical tables: 1) filename->blocksequence,version 2) block->machinelist The first table is stored on disk and is very precious. The second table is rebuilt every time the NameNode comes up.

Author:

Mike Cafarella

Field Summary

Fields inherited from class org.apache.nutch.ipc.Server

LOG

Constructor Summary

NDFS.NameNode()
Create a NameNode at the default location

NDFS.NameNode(File dir, int port)
Create a NameNode at the specified location

Method Summary

Writable	call(Writable param) This method implements the call invoked by client.
static void	main(String[] argv)

Methods inherited from class org.apache.nutch.ipc.Server

join, setTimeout, start, stop

Methods inherited from class java.lang.Object

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

Constructor Detail

NDFS.NameNode

public NDFS.NameNode()
              throws IOException

Create a NameNode at the default location

NDFS.NameNode

public NDFS.NameNode(File dir,
                     int port)
              throws IOException

Create a NameNode at the specified location

Method Detail

call

public Writable call(Writable param)
              throws IOException

This method implements the call invoked by client. Return a Writable as the function return value.

Specified by:

call in class Server

Throws:

IOException

main

public static void main(String[] argv)
                 throws IOException,
                        InterruptedException

Throws:

IOException

InterruptedException