Messaging

Words

All learned. See them in History.

• Backpressure

  A way for a slow consumer to make a fast producer slow down, instead of letting work pile up until memory runs out.

• Dead-letter queue

  A side queue where a message goes after it has failed a set number of times, so one broken message stops looping in the main queue.

• Fan-out

  Sending one incoming message or request out to many receivers at once.

• Pub/sub

  A publisher sends an event to a topic without knowing who listens, and every subscriber to that topic gets its own copy.

• Queue

  A list of jobs that producers add to and workers take from, so slow work happens in the background instead of inside the request.