When group communication is present, some method is needed for creating and dele

Question

When group communication is present, some method is needed for creating and deleting groups, as well as for allowing processes to join and leave groups. One possible approach is to have a group server to which all these requests can be sent. The group server can then maintain a complete data base of all the groups and their exact membership, however shares a major disadvantage with all centralized techniques:
    a. it has a single point of failure.
    b. it is hard to implement.
    c. it requires operating system customization.
    d. it requires programming.

Most network layers offer reliable point-to-point channels, but they rarely offer reliable communication to a collection of processes.
    a. true
    b. false

In a given process group, one process is the coordinator and all the others are workers. In this model, when a request for work is generated, either by an external client or by one of the workers, it is sent to the coordinator. The coordinator then decides which worker is best suited to carry it out, and forwards it there. This approach is called:
    a. arbitrary
    b. hierarchical

The distributed commit problem involves having an operation being performed by each member of a process group, or none at all.
    a. true
    b. false

Adding extra bits to allow recovery from garbled bits is called information redundancy.
    a. true
    b. false

Explanation / Answer

1. a) It has a single point of failure

If the group servers crashes then all the functionalities will be stopped. Along with that all the group's will be gone those need to be constructed again.

2. a. True

Network Layers are responsible for point to point channels.

3. Hierarchical Process

In hierarchical process the system will have working mode according to the ranking. Which Means coordinator will decide which worker is best suited and who need to do that.

4.a. true

In this among the participants if even one participant aborts the coordinator will ask all the participants to abort. In this each member in the group need to be performed or none at all.

5. a. True

Information redundancy means adding extra bits to recover garbled bits.

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