- meta-data.py 
- copy.py 
- ls.py 
- data-node.py

meta-data.py: Handles communication between data-nodes and copy/list clients. As each data-node
              registers, the meta-data will store its info and keep track of each file assosiated
              with each data-node ;


ls.py: Communicates with the metadata server and asks for a list of all files stored in the file system.
       Displays all files with its full path and the size of the file ;


copy.py: This file has two functionalities:
            
            - copy to file system: 

              This function opens the file chosen to copy(if exists), 
              sends a packet with the file name and info to the metadata server which stores it for 
              further use; the metadata server then sends the copy client a list of data-node servers to 
              have the file stored distributedly over them. If the file isn’t already registered in our
              file system, the file that will be copied to our file system is then separated into blocks 
              and sent to the data-nodes. The data-nodes will then receive the file chunk by chunk, 
              storing each chunk in its respective block and then communicates to the metadata server 
              the name of the file where the blocks will be stored and the location of each block(data-nodes).  

            - copy from file system:

            This function communicates with the metadata server asking it for the list of data-nodes storing the 
            data blocks of the file being requested to copy. If the file is in the dfs, a destination file is
            opened to store the data blocks, the data-servers return their respective blocks and they are written
            in the destination file. 


data-node.py: The data-node is in charge of storing the data blocks sent by the copy client. Each data-node
              opens a file, writes the data blocks to the chosen destination file and sends back the block
              id to the copy client.
              The data-node is also responsible for handling data requests. When data is requested(asked to copy
              from the dfs to the local dile system) the data-server opens the wanted file and sends its data blocks
              to the copy client. 

- TERMINAL 1
    $ python meta-data.py localhost <metaport, leave black for default 8000>

- TERMINALS 2, 3 & 4
    $ python data-node.py localhost 8080 ~/datadir0
    $ python data-node.py localhost 8081 ~/datadir1
    $ python data-node.py localhost 8082 ~/datadir2

Up to now you have started up the metadata server and 3 data-node servers for file storage. 
The file system is empty though, so lets copy some files into it:

- TERMINAL 5
    $ python copy.py ~/<FILE OF YOUR CHOOSING> localhost:<metaport>:<NEW FILE NAME>

    NOTE: THIS MIGHT TAKE A WHILE IF ITS A LARGE ENOUGH FILE. 

This process might take a while if the file is large enough. Once its done, try listing the file or files
you copied to the file system.

- TERMINAL 5
    $ python ls.py localhost

If youve seen your files listed, try copying them back to your system now.

- TERMINAL 5
    $ python copy.py localhost:<metaport>:<FILE NAME> ~/<DESTINATION OF NEW FILE>