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NPTEL Cloud Computing and Distributed Systems Assignment 3 Answers
Q1. In a Classical Algorithm of Ring Election, what will be the message complexity for N labelled processes.
Answer: C. (3N-1) messages
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Q2. True or False ?
There is no leader election algorithm for anonymous rings, even if algorithm knows the ring size (non-uniform) and synchronous model.
Answer: True
Q3. True or False ?
Zookeeper is a replicated service that holds the metadata of distributed applications.
Answer: True
Q4. True or False ?
“Leader Election problem represents a general class of non symmetry-breaking problems.”
Answer: True
Q5. ZooKeeper itself is intended to be replicated over a sets of hosts called :
Answer: B. Ensemble
Q6. Find the message and time complexity of below algorithm:
send value of own id to the left
when receive an id j (from the right):
if j > id then
forward j to the left (this processor has lost)
if j = id then
elect self (this processor has won)
if j < id then
do nothing
Answer: A. O(n2) Messages and O(n) time
Q7. In the O(nlogn) messages leader election algorithm, the probe distance in phase k is _______ and the Number of messages initiated by a processor in phase k is at most ______________including probes and replies in both directions.
Answer: D. 2k,4∗2k
Q8. Consider the following statements:
Statement 1: When two processes are competing with each other causing data corruption, it is called deadlock
Statement 2: When two processes are waiting for each other directly or indirectly, it is called race condition.
Answer: C. Both statements are true
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