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Distributed Systems - Coggle Diagram

- - - - RMI
      - RPC
      - Realtime transfer
      - Notifications
    - - Ajout des machines
      - Use of legacy services
      - Adding services
    - - Adding users & ressources is possible
      - Cost is proportional to (users,ressources)
    - - Access
      - Localisation
      - Concurrency
      - Duplication
      - Pannes
      - Mobility
      - Reconfiguration
      - Scaling
    - - Detection
      - Masquage
      - Tolérance
      - Reprise
  - - - Basés bus
        
        Systèmes basés Bus
        
        Sys basés switch
      - Mémoires basés
        
        Sys à mémoire partagée
        
        Sys à mémoire locale
    - - Systèmes d'exploitation réseau
        
        Distributed Application layer
        
        Services
        
        Remote access SSH
        
        File exchange
        
        Fails
        
        Manque de transparence
        
        Independent machinery, requires human interaction
      - Systèmes d'exploitation distribués
        
        MCOS
        
        Message sharing
        
        MPOS
        
        Use of semaphores & monitors
        
        Distributed services & Application layer
  - - - Mobile code
        
        Java applets lol
        
        Response time
        
        Access to local resources
      - Mobile agents
        
        Code + Data
        
        Common task fulfillment
        
        Install & maintain software
        
        Load balancing
      - Limited clients
        
        Client only has an installer
        
        Only an interface
        
        Longer response time
      - Rôle repartition
        
        Levels
        
        Interface level
        
        Data level
        
        Computation level
      - Multi-tiers
        
        1-tier
        
        Mainframes
        
        Users interact with a monolythic app
        
        2-tiers
        
        Platforms
        
        Server platform
        
        RPC
        
        Client platform
        
        (makes computations)?fat:light
        
        Configurations
        
        Client has a terminal
        
        Client has an interface
        
        Client does some verifications
        
        DataBase only in server
        
        Edge Computing
        
        3-tiers
        
        Added Database server
        
        Avantages
        
        Each tier is independent
        
        Reduce info exchg
        
        Database is fragmentable
        
        Computation scalability
        
        Duplicable database & app servers
        
        Easier maintenance
      - WWW apps
    - - proxy
      - Security
        
        firewall
    - - Symmetrical protocoles, TCP/IP
      - Avantages
        
        Cost reduction, no servers needed
        
        Scalable
        
        good for ad hoc networks, libre à connecter ou déconnecter
        
        "Fiability", tolérance aux pannes
      - Inconvénients
        
        Security
        
        compatibility
        
        Availability
        
        Resources can get unavailable
      - Centralisée, assisted p2p
        
        Use of a server to set connections
        
        SPOF
        
        Bottleneck
      - Ring
        
        Pour les machines proches
      - Hierarchy
        
        Reduces traffic
      - Pure P2P
        
        Diffuse
        
        Elections
- - - - methods
        
        client-server
        
        Object model
  - - - With Supervisory server
      - with token ring
- - - - Processes know only events they made
      - Know only msg they sent or received
      - pas de relation d'ordre strict sur des machine distantes
    - - Duplication
      - Partitioning
  - - - Structural propoertis
        
        Star
        
        Ring
        
        Complete
        
        Tree
      - Comportelental properties
        
        Hypos
      - Trafic cost