:param queue_url: URL of the SQS queue to read. Note: this continues to generate messages until the queue is empty.Įvery message on the queue will be deleted. parse_args () def get_messages_from_queue ( sqs_client, queue_url ): """Generates messages from an SQS queue. add_argument ( "-dst-url", required = True, help = "Queue to move messages to" ) return parser. add_argument ( "-src-url", required = True, help = "Queue to read messages from (e.g. ArgumentParser ( description = "Move all the messages from one SQS queue to another." ) parser. """ import argparse import sys import boto3 def parse_args (): """Parse command-line arguments.""" parser = argparse. Usage: redrive_sqs_queue.py -src-url= -dst-url= Move all the messages from one SQS queue to another. Run it by passing the URL of the source and destination queue as arguments: You can download the file, or copy/paste the source code below. Usually that’s enough time for the script to finish running, so it’s not an issue for us, but it is something to be aware of.Īs with most of my scripts, this is written in Python. Our queue-backed workers scale down to zero when the queue is empty, and they take a few minutes to start up when the queue starts filling. The messages would bounce back-and-forth forever. The script would then resend them to the input queue, and the worker would send them back to the DLQ. It uses code I shared two years ago to dump the contents of an SQS queue.īe careful running this code – if the worker is running, and it picks up the messages immediately, they might go back to the DLQ if there’s another problem with the worker. Although we primarily use this to redrive problematic messages that went to a DLQ, this script allows you to move messages between an arbitrary pair of SQS queues. There’s no way to do this in SQS directly, so we’ve written a script to do it for us. Once we’ve found the problem in the worker, fixed the bug and deployed a new version, we want to send all the messages from the DLQ back to the original input queue, so they can be processed by the updated worker. You can configure SQS to send such problematic messages to a dead-letter queue (DLQ), where you can inspect them in isolation and work out what went wrong. Sometimes a task can’t be processed successfully – for example, if there’s a bug in the worker code. To address this, we explore a custom solution rather than relying on the built-in SQS redrive feature. Boxes, L–R: a pink box (labelled “input queue”) a black dashed box (labelled “worker”) another pink box (labelled “output queue”). While AWS Lambda functions have a maximum runtime of 15 minutes, orchestrating an action after precisely 6 hours poses a challenge. worker input queue output queue Three boxes joined by arrows, pointing from left to right. When the worker is done, it sends the message to another queue, where another worker can pick it up. We write tasks to an SQS queue, and then a worker application reads the tasks from the queue and does some processing. If other arguments are provided on the command line, those values will override the. The JSON string follows the format provided by -generate-cli-skeleton. This error occurs when the DLQ redrive fails because the AWS Identity and Access Management (IAM) entity doesn't have the required permissions.At work, we make heavy use of Amazon SQS for message queues. -cli-input-json-cli-input-yaml (string) Reads arguments from the JSON string provided. Error code: AccessDenied - Queue Permissions to Redrive" error This error occurs when the DLQ redrive fails because the Amazon SQS source queue doesn't exist or was deleted. Then, enter the Amazon SQS queue ARN to move all messages from the DLQ to the destination queue. To resolve this error, choose Redrive to a custom destination when you start the redrive. A message from the Amazon Simple Notification Service (Amazon SNS) topic or AWS Lambda function that has the DLQ configured.An Amazon SQS message that's sent with the SendMessage API call to the DLQ.If the DLQ has one of these messages, then you might receive this error when you try to start a DLQ redrive to the source queue: It also helps if the function fails to process an event from the corresponding SQS FIFO queue multiple times. ![]() ![]() This is useful in case SNS cannot deliver an event to the subscribed SQS queue. "Failed: CouldNotDetermineMessageSource" error This sample follows the SQS best practices and SNS redrive policy recommendations and configures dead-letter queues (DLQ). MaximumMessageSize The limit of how many bytes a message can contain before Amazon SQS rejects it. Valid values: An integer from 0 to 900 seconds (15 minutes). If you don't configure the Amazon SQS queue as a DLQ, then the Start DLQ Redrive icon is inaccessible in the Amazon SQS console.įor more information, see Configuring a dead-letter queue redrive. DelaySeconds The length of time, in seconds, for which the delivery of all messages in the queue is delayed. Resolution Grayed out "Start DLQ redrive" icon
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