Message Passing system is subsystem of Distributed System that provides a set of message based IPC protocol and does so by hiding details of complex network protocols and multiples heterogeneous platform from programmers.
* 2 Primitives: Send 2 Receive.*
Features of Message Passing:
Simplicity:
Simple and Ease to use. Simple and Clear Semantics of IPC Protocols of message passing makes it easier.
Uniform Semantics:
There are two types of communication :
1.Local
2.Remote
Semantics of Remote should be as close as possible to local communication for ease of use.
Efficiency :
It can be made efficient by reducing number of message exchange.
Avoiding cost of setting and terminating connections between the same pair.
Minimizing the cost of maintaining connections.
Piggybacking.
Reliability :
Distributed System is prone to node crashes or communication link failure resulting into loss of data.
Handling of lost message
Duplicate messages, capable of detecting and handling duplicates.
Generating and assigning appropriate sequences
Correctness :
Issues
Atomicity: Message to All of None.
Order Delivery: Message in Order.
Survivability: Message delivery despite of partial failure.
Flexibility :
User may choose types and level of reliability
Synchronous/Asynchronous, Send/Receive Choice.
Security:
It must provide secure end to end communication.
Necessary Steps:
Authentication of receiver by sender.
Authentication of sender by receiver.
Portability:
Two Aspects:
Message passing system should itself be portable.
Applications written by using primitives of IPC Protocols of Message Passing System should be Portable.
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