09/14/05 1 Implementing Remote Procedure Calls* Birrell, A. D. and Nelson, B. J. Presented by Emil Constantinescu *ACM Trans. Comput. Syst. 2, 1 (Feb.

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Presentation transcript:

09/14/05 1 Implementing Remote Procedure Calls* Birrell, A. D. and Nelson, B. J. Presented by Emil Constantinescu *ACM Trans. Comput. Syst. 2, 1 (Feb. 1984), 39-59

09/14/05 2 Overview  Brief introduction  RPC issues  Implementation  Examples  Current RPC implementations  Review  Conclusions

09/14/05 3 What are Remote Procedure Calls (RPCs).... in a nutshell (1) RPCs represent a set of communication paradigms that allow one procedure to call another procedure on a different machine. 1.one procedure (caller) calls another procedure (callee) 2.the caller waits for the result from the callee 3.the callee receives the request, computes the results, and then send them to the caller 4.the caller resumes upon receiving the results from the callee

09/14/05 4 What are Remote Procedure Calls (RPCs).... in a nutshell (2) invokes a procedure on the callee arguments waits receives the request sends the results results resumes computes the results CALLEE CALLER

09/14/05 5 Attractive aspects:  simple semantics  efficiency  generality PURPOSE: Make distributed computing easy! MAIN PRINCIPLE: The procedure's communication patterns are transparent to the user. The procedure invocation looks just like a local procedure call. What are Remote Procedure Calls (RPCs).... in a nutshell (3)

09/14/05 6  transparency, mimics the local procedure call precise semantics  precise semantics  machine failure  communication failure address based arguments  address based arguments  the address space is not shared programming integration  programming integration  integration into programming environment data integrity  data integrity RPC Issues (1)

09/14/05 7 data transfer protocols  data transfer protocols  network protocols  binding  caller determines  the location  the identity  … of the callee  security  open communication network RPC Issues (2)

09/14/05 8 RPC Implementation (1) – Basic Concepts program module … call procedure_X(arg1,arg2,ret1) … program module implement procedure_X(arg1,arg2,ret1) { … } local program remote program import procedure_X export procedure_X interface NAME | type | type | type procedure_X | arg1 | arg2 | ret1 procedure_Y | arg1 | ret1 procedure_Z | arg1 | ret1 | ret2

09/14/05 9 Caller machine User local call local return pack argument unpack result interface transmit receive User - stub RPCRuntime Callee machine Server call return unpack argument pack result interface transmit receive Server - stub RPCRuntime Network wait exporterimporterexporterimporter call packet result packet work RPC Implementation (2) – Overview Database registerlookup

09/14/05 10 RPC Implementation (3) – Local vs. Remote local *Garry Nutt; Operating systems; 2nd Edition, Addison Wesley (*) work Caller machine User local call local return pack argument unpack result User - stub Callee machine Server call return unpack argument pack result Server - stub exporterimporterexporterimporter

09/14/05 11 RPC Implementation (4) – Local vs. Remote remote *Garry Nutt; Operating systems; 2nd Edition, Addison Wesley (*)

09/14/05 12 RPC Implementation (5) – User/Server Stub User/Server Stub:  arguments are serialized/marshaled  handles language binding (IDL, object passing)  pass by value not by reference

09/14/05 13 Caller machine transmit receive RPCRuntime Callee machine transmit receive RPCRuntime Network wait call packet result packet RPC Implementation (6) – RPCRuntime Database registerlookup RPCRuntime deals with  data (re)transmission  data acknowledge  packet routing  encryption  exception handling  binding

09/14/05 14 Caller machine transmit receive RPCRuntime Callee machine transmit receive RPCRuntime Network wait call packet result packet RPC Implementation (7) – Binding Database registerlookup Binding … is concerned with  location  identity … implements  ImportInterface  ExportInterface … has issues  granularity  security

09/14/05 15 RPC Implementation (8) – RPC flow * Garry Nutt; Operating systems; 2nd Edition, Addison Wesley (*)

09/14/05 16 RPC Implementation (9) – Semantics Server REQ. REP. Receive Execute Reply Server REQ. No REP. Receive Execute Crash * A. Tanenbaum and M.v. Steen; Distributed Systems: Principles and Paradigms, Prentice Hall, 2002 Server REQ. No REP. Receive Crash Semantics & Data Transfer issues  scalable, connectionless scheme, reduced acknowledgements  unique ID/incremental packets  at least/most or exactly once semantics (*)

09/14/05 17 Caller machine User local call local return pack argument unpack result interface transmit receive User - stub RPCRuntime Callee machine Server call return unpack argument pack result interface transmit receive Server - stub RPCRuntime Network wait exporterimporterexporterimporter call packet result packet work Database registerlookup RPC Implementation & Issues program integration binding data transfer security data integrity address based arguments

09/14/05 18 RPC Implementations (1)  DCE RPC (Distributed Computing Environment RPC)  SUN RPC  DCOM (Distributed COM)  CORBA (Common Object Request Broker Arch.)  XML RPC  SOAP (Simple Object Access Protocol)

09/14/05 19 RPC Implementations (2)  DCE RPC  low level  handles the binding & transport  Sun RPC  DCOM & CORBA  object abstractions A. Tanenbaum and M.v. Steen; Distributed Systems: Principles and Paradigms, Prentice Hall, 2002 object abstraction

09/14/05 20 RPC Implementations (3)  XML RPC & SOAP  somewhat lightweight  use HTTP and XML  Port 80

09/14/05 21  Transparency is imperative, and leads to effectiveness  Maintain local procedure calling semantics  Binding strategies influences efficiency  Emulate shared address space  Timeout implementation Conclusions & Future Research

09/14/05 22 Paper:  Birrell, A. D. and Nelson, B. J.  “Implementing Remote Procedure Calls”  ACM Transactions on Computer Systems  published in 1984  first paper to formalize RPC  concepts started to appear in 1976 About the paper (1)

09/14/05 23 About the paper (2)  Special treatment for missing remote implementation (late binding)  What if the client crashes?  Machine specific binary data representation  RPC in the HPC field?

09/14/05 24 Birrell, A. D. and Nelson, B. J.; Implementing remote procedure calls; ACM Trans. Comput. Syst. 2, 1 (Feb. 1984), Garry Nutt; Operating systems; 2 nd Edition, Addison Wesley Andrew Tanenbaum and Maarten van Steen; Distributed Systems: Principles and Paradigms, Prentice Hall, 2002 References

09/14/05 25 Any Questions?

09/14/05 26 Paper Implementation (1) Binding

09/14/05 27 Paper Implementation (2) Simple RPC

09/14/05 28 Paper Implementation (3) “Complicated” RPC

09/14/05 29 Paper Implementation (4) Results