EOS~2: Unstoppable Stateful PHP

摘要

A growing number of businesses deliver mission-critical applications (stock trading, auctions, etc.) to their customers as Web Services. These applications comprise heterogeneous components distributed over multiple layers. They pose strong requirements for service and consistent data availability from both legal and business standpoints. Since many systems count many millions of lines of code, some bugs pass quality assurance undetected which leads to unpredictable service outages at some point.Recovery in transactional systems guarantees: ⅰ) that an operation sequence declared as a transaction is executed atomically (either completely or not at all when interrupted by a failure) ⅱ) and that completed transactions persist all further failures. Atomicity and persistence do not suffice to guarantee correctness. It is the application that needs to handle timeouts and other exceptions, retry failed requests to servers, handle message losses, and prepare itself with a full suite of failure-handling code.