Diff algorithms are the basis of many everyday developer tools such as Git. But there's limited knowledge on the subject. Here we collate our research to provide systematic knowledge on deltas and diffs.

Converting a distributed system to FIFO and exactly-once message processing requires considerable user effort. This article looks at why this is the case, serving as a guide about what to bear in mind when implementing a FIFO and exactly-once message processing scenario using SQS FIFO queues.