Three application servers each running the same crontab means every scheduled task runs three times, and the invoice job discovers this before you do. The lock is a…
A retry policy applied at the HTTP client level retries everything, including the POST that succeeded and whose response was lost. The safety of a retry is a…
RabbitMQ pushes messages to a consumer up to the prefetch limit without waiting for acknowledgements. With the default of unlimited, one consumer takes the whole queue into its…
A message is delivered, acknowledged and gone. Treating the queue as a record of what happened means the record disappears as it is processed, and there is nothing…
basic_publish returns as soon as the message is written to the socket. The broker may not have accepted it, may not have routed it anywhere, and may have…
A scheduled task that occasionally runs longer than its interval will be started again while the first is still going, which for an import means two processes writing…