Computers and Technology, 17.06.2020 03:57 briannagotfanz

A client is the only reader and writer of a data item X. Client moves between locations L1 and L2. A server at each location has a replica of the item X and also stores X's local version number (generation). The client reads and writes are always performed locally. A read operation R also returns the local version number of the item X. The initial version number of each copy is equal to 0. A write W increments the (local) version number by 1. PW is an update operation to the remote copy (e. g. after a local W). PW carries the version number of X and stores it with the update. The is the time line and the time grows from left to right. Required:
a. Does the sequence of operations below provide monotonic-read consistency? Explain why it does or does not.

L1 W R R
L2 PW W R

b. Does the sequence of operations below provide monotonic-write consistency? Explain why it does or does not.

L1 W R R
L2 PW W R

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A client is the only reader and writer of a data item X. Client moves between locations L1 and L2. A...

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