(CPDS) Consistency and Replication - Models

Which of the following consistency models uses the absolute global time as the reference to determine the order of the operations?

• Strict consistency
• FIFO consistency
• Sequential consistency
• Causal consistency

Which of the following consistency models guarantees that all the processes see the same interleaving of operations, which must preserve the individual program order of each process but might not be ordered in time?

• Linearizability
• Sequential consistency
• Causal consistency
• FIFO consistency

What consistency model guarantees that all the processes see the same interleaving of operations which are ordered according to timestamps assigned from the loosely synchronized clocks at every node?

• Strict consistency

• Linearizability

• Sequential consistency

• Causal consistency

Which of the following consistency models requires the involvement of the programmer to maintain the consistency?

• Sequential consistency
• Weak consistency
• Eventual consistency
• Writes-Follow-Reads consistency

Which of the following models provides consistency among groups of operations instead of individual operations?

• Weak consistency
• Causal consistency
• Sequential consistency
• FIFO consistency

Which of the following consistency models is a mobile client expecting when he/she commits a new version of a code to a SVN repository located in some replica in a data store and later he/she commits a newer version in another replica?

• Monotonic Reads
• Monotonic Writes
• Read Your Writes
• Writes Follow Reads

Which consistency model is a mobile client expecting when he reads a post of a distributed newsgroup in a replica of a data store and later he plans to write a reaction to that post in another replica?

• Monotonic Reads
• Monotonic Writes
• Read Your Writes
• Writes Follow Reads

What consistency model does a data store provide to a mobile client if prior to the execution of a read operation by this client in a given replica it checks the client's write set to ensure that the write operations in the set have taken place at the replica?

• Read Your Writes
• Monotonic Reads
• Monotonic Writes
• Writes Follow Reads

Which of the following models provides less strict consistency constraints?

• Sequential consistency
• Causal consistency
• Eventual consistency
• Writes-Follow-Reads consistency

Which of the following models defines stronger consistency constraints?

• Entry consistency
• Linearizability
• Sequential consistency
• Writes-Follow-Reads consistency