Event Processing

• SQS + lambda
• If lambda fail to process, send it to DLQ
• FIFO SQS + lambda
• If lambda fail to process, send it to DLQ
• Fan Out Pattern
• Event first goes to the SNS
• SNS pass the event to multiple SQS or consumer
• Let's say, we have 3 SQS service, get same message from application
  • If application crashed after send 2 SQS, the 3rd SQS does not get the message
  • In this case, Fan Out came up
  • Here application only send the message to SNS
  • SNS pass the messages to the respective SQS
• S3 event can be passed to
• SQS
• SNS
• lambda