Discuss the functions of the implementation repository from the point of view of scalability and fault tolerance.
What will be an ideal response?
The implementation repository is used by clients to locate objects and activate implementations. A remote object reference contains the address of the IR that manages its implementation.
An IR is shared by clients and servers within some location domain.
To improve scalability, several IRs can be deployed, with the implementations partitioned between them (the object references locate the appropriate IR). Clients can avoid unnecessary requests to an IR if they parse the remote object reference to discover whether they are addressing a request to an object implementation already located.
From the fault tolerance point of view, an IR is a single point of failure. Information in IRs can be replicated - note that a remote object reference can contain the addresses of several IRs. Clients can try them in turn if one is unobtainable. The same scheme can be used to improve availability.
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