We continue discussing the ZooKeeper. It is a co-ordination service with elements from group messaging, shared registers and distributed lock services. It provides a interface that guarantees wait-free property and FIFO execution of requests from each client.  Requests across all clients are also linearized.
We were discussing the throughput of ZooKeeper when the system is saturated and changes on various injected failure. A large number of clients connected and this number was kept the same while the servers were varied. This simulated a large load and it was seen that the number of servers had a negative impact on performance. Read throughput is consistently higher than write throughput.Write requests had to go through atomic broadcast. Transactions are logged to non-volatile store. These contribute to the difference in throughput.

#codingexercise
Find three elements in an array that satisfy Pythagorean theorem
Solution:
        1. Square all the elements
        2. Sort all the squares
        3. For every element from the end as item
                  Iterate from start to the element just previous to this item as candidate
                            let difference = item - candidate
                                 if difference >= candidate and difference exists between candidate and item by binary_search
                                     return Tuple<int, int, int> as candidate, difference, item

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