Cliser
- 1. Client/Server Computing (the wave of the future) Rajkumar Buyya School of Computer Science & Software Engineering Monash University Melbourne, Australia rajkumar@dgs.monash.edu.au
- 2. Agenda Why client server ? Models Architecture Tools Applications Conclusions
- 3. A simple definition A simple definition of CS is “ server software accepts requests for data from client software and returns the results to the client”
- 4. Elements of C-S Computing a client, a server, and network st ue q Re Client Server Network Re su lt Client machine Server machine
- 5. Where Operations are Done In CS Relationship “most of the application processing is done on a computer (client side), which obtains application services (such as database services) from another computer (server side) in a master slave configuration
- 6. CS-Focus is on In client-server computing major focus is on SOFTWARE
- 7. Application Tasks User Interface User Interface Presentation Logic Presentation Logic Application Logic Application Logic Data Requests & Results Data Requests & Results Physical Data Management Physical Data Management
- 8. Client (dumb) - Server Model Server e ok Client str ey K Presentation Logic Network Di Application Logic sp lay s DBMS
- 9. True Client-Server Model Server e ok Client str ey K Application Logic Presentation Logic Network Pr o Re ces DBMS su s e d lts
- 10. Distributed Client-Server Model Server rie ed Client u e ss Q o ce s Pr Application Logic Application Logic Network Pr o Re ces DBMS Presentation Logic su s e d lts
- 11. Client-server computing is distributed access, not a distributed computing.
- 12. RPC Look and Feel like Local Calls results= calling results= called bar(arguments) procedure bar(arguments)procedure arguments arguments results results calling results= procedure bar(arguments) (client) client stub server stub network transport network transport arguments results request message request message reply message reply message called procedure (client) Network Local Procedure Call Remote Procedure Call
- 13. Flow Control in a Sychronous RPC Client Machine Server Machine Service Daemon Listening Client Program RPC Call Invoke Service Executes Service with Request Service Call Client Waiting Netw ork return() answer return ( ) reply Request Completed May be the same machine
- 14. Multithreaded Server Server Process Client Process Server Threads Client Process User Mode Kernel Mode Message Passing Facility
- 15. Categories of Servers File Server Data Server Compute Server Database Server Communication Server Video Server
- 16. File Server File Servers manage a work group’s application and data files, so that they may be shared by the group. Very I/O oriented Pull large amount of data off the storage subsystem and pass the data over the network Requires many slots for network connections and a large-capacity, fast hard disk subsystem.
- 17. Compute Server Performs Application logic processing Compute Servers requires processors with high performance capabilities large amounts of memory relatively low disk subsystems By separating data from the computation processing, the compute server’s processing capabilities can be optimized
- 18. Cluster as Compute Server
- 19. Data Server Data-oriented; used only for data storage and management Data Server Since a data server can serve more than one compute server, compute- intensive applications can be spread among multiple severs Compute Does not prefer any application Server logic processing Performs processes such as data validation, required as part of the data management function. Requires fast processor, large amount of memory and substantial Hard disk capacity.
- 20. Cluster as High Availablity Data Server Data Server Compute Server
- 21. Database Server Most typical use of technology in client-server Accepts requests for data, retrieves the data from its database(or requests data from another node)and passes the results back. Compute server with data server provides the same functionality. The server requirement depends on the size of database, speed with which the database must be updated, number of users and type of network used.
- 22. Communication Server Provides gateway to other LANs, networks & Computers E-mail Server & internet server Modest system requirements multiple slots fast processor to translate networking protocols
- 23. Internet Server PC client Internet Server Local Area Network UNIX workstations
- 24. Distributed processing application connects to remote database SQL* Forms SQL *Net TCP/IP UNIX Server Distributed database application SQL *Net connects to local database which TCP/IP connects to remote database SQL * Forms ORACL E SQL *Net TCP/IP ORACLE Database Configurations
- 25. Ethernet era Intergalactic era client/server client/server First Wave Second Wave Third Wave Database servers File Distributed servers w ar e up objects gro TPtors i m on 1982 1986 1990 1994 1998
- 26. The Client/Server Infrastructure Client Middleware Server Service Specific SQL/IDAPI TxRPC Mail ORB Objects GUI/OOUI DSM Groupware SNMP CMIP DME TP NOS monitor Directory Security Distributed file RPC Messaging Peer-to-peer DBMS DSM Transport Stack DSM NetBIOS TCP/IP IPX/SPX SNA Operating System Operating System
- 27. Thank You ... Thank You ... ?