Queues & Workers


  1. messages are sent to SQS.
  2. A static amount (configurable) of PHP workers are kept alive by the Supervisor.
    • Given the nature of PHP, we optimize workers to stop and restart every X minutes.
  3. While workers are running, they attempt to fetch messages from SQS.
    • If a worker gets a message then it starts working on that job and takes it to completion.
    • If a worker crashes while processing then the Supervisor will bring it back up.
      • What will happen to the message that was pulled off the queue by that "crashed" worker?
      • Will the resurrected worker start work on the same exact message again?

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