21 April 2012

Idempotence Is Not a Medical Condition - ACM Queue

Idempotence Is Not a Medical Condition - ACM Queue
In a world full of retried messages, idempotence is an essential property for reliable systems. Idempotence is a mathematical term meaning that performing an operation multiple times will have the same effect as performing it exactly one time. The challenges occur when messages are related to each other and may have ordering constraints. How are messages associated? What can go wrong? How can an application developer build a correctly functioning app without losing his or her mojo?

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