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Distributed backup service

How to run

From the Project's root folder:

  1. To compile in LINUX/UNIX: using a terminal, navigate to the project's root folder and run the 'compile.sh' script:

sh compile.sh

  1. To start the RMI registry run the 'rmi.sh' script:

sh rmi.sh

  1. To start a peer, use the 'peer.sh' script:

sh peer.sh <protocol_version> <peer_id>

(e.g. sh peer.sh 2.0 1)

  1. To run the TestApp:

  • open a terminal, navigate to the project's root folder and type "sh <test_action>.sh"    - <test_action> is one of backup, restore, reclaim, delete or state.

  • To clear the peers' file system, run the 'clearFilesystem.sh' script:

    sh clearFilesystem.sh

How to compile

The project can be compiled as usual with the javac command, or by running sh compile.sh from the project's root folder.

RMI registry

As suggested, the interface implementation uses RMI. In order to interact with the service, an rmiregistry instance must be running inside bin folder.

The following command launches an rmiregistry instance in the background: rmiregistry &

Peer

If the user intends to interact with a peer, a name for the remote object must be specified, hence the alternative usages:

To run a peer:
Usage: java -classpath bin service.Peer <protocol_version> <server_id> <service_access_point> <mc:port> <mdb:port> <mdr:port>

Argument description:
		protocol_version - version of protocol used (1.0, 1.1, 1.2, 1.3 or 2.0)
		server_id - Integer representing the peer’s unique identifier
		service_access_point - host to access the rmi registry (format explained on RMI Registry section)
		mc:port - IP address:Port of the CONTROL channel
		mdb:port – IP address:Port of the BACKUP channel
		mdr:port – IP address:Port of the RESTORE channel
				
        Protocol version:                   service_access_point:
          1.0 -> Default                          - Formats on Peer: //host(:port)?/
          1.1 -> Backup Enhancement               - Formats on testApp: //host(:port)?/peerID
          1.2 -> Restore Enhancement
          1.3 -> Delete Enhancement
          2.0 -> All Enhancement
		
Eg. java -classpath bin service.Peer "$1" "$2" //localhost/ 224.0.0.0:8000 224.0.0.0:8001 224.0.0.0:8002

Test App

To run test app
 Usage: java TestApp <peer_ap> <sub_protocol> <opnd_1> <opnd_2
 
 Argument description:
		peer_app – local peer access point
		sub-protocol – can be BACKUP, RESTORE, RECLAIM, DELETE or STATE
		opnd_1 – path name of the file or amount of space to be reclaim
		opnd_2 – specifies the desired replication degree. Applies only to backup sub-protocol
 
Eg.
 java -classpath bin service.TestApp //localhost/1 BACKUP "files/image1.png" 1
 java -classpath bin service.TestApp //localhost/1 DELETE "files/image1.png"
 java -classpath bin service.TestApp //localhost/2 RECLAIM 140000
 java -classpath bin service.TestApp //localhost/1 RESTORE "files/image1.png"
 java -classpath bin service.TestApp //localhost/1 STATE

Defaults

Usages where the user does not specify the multicast addresses and ports will have the following defaults (on script):

RMI MC MDB MDR
//localhost:1099/ 224.0.0.0:8000 224.0.0.0:8001 224.0.0.0:8002

The default size of a peer on system is 8MB.

Local files and configuration

  • The source files are under the project src folder.

  • The class files are under the project bin folder.

  • The files used to test are under the project files folder.

  • The filesystem of each pear are under the project fileSystem folder, on each peer contains a peerID folder that contains chunks folder, restore folder and db file. Each chunks folder contains folders named by fileID that contains chunks backed up which belongs to that file.

You need not generate these files manually. Once the Peer is launched for the very first time, they will be automatically created.

You should not manually edit db. These files are managed by the service.

Scripts' Specification

  • compile.sh

    • Script to compile java classes into a bin folder.

  • clearFileSystem.sh

    • Script to delete fileSystem of peers.

  • peer.sh

    • Script to launch an instance of a peer with some parameters.

      Usage: peer.sh <peer_num> Eg. sh peer.sh 1.0 1

  • Others scripts

    • Action scripts (backup.sh, restore.sh, delete.sh) run in peer 1 with default file as image1.png
    • The script 'reclaim.sh' runs in peer 2 with a size of 140000 (reclaiming all used memory above 140KB).
    • And the script state.sh retrieve information about peer 1 and peer 2.  - All scripts use the localhost ip by default (127.0.0.1).