![]() ![]() This sequence of events is show in the diagram below, taken from the SQS Developer Guide –īy default SQS will continue to republish an unacknowledged message until the message reaches a max age defined by the queue’s configured Message Retention Period. SQS will make the message available again on the queue for re-processing after the Visibility Timeout expires. If your message consumer encounters an error during the processing of an SQS message (at any point between receiving and acknowledging / deleting it), and it doesn’t have any error handling of its own, then the message will be left unacknowledged. Understanding SQS’ Default Message Delivery Behaviour This post explains how you can do both these things, including how to classify message processing errors. ![]() But, if you want to handle all types of errors efficiently you should also add your own custom error handler. If you’re using Amazon SQS as your message broker it provides some built-in support for error handling that you can utilise. Similarly, the dead-letter queue of a standard queue must also be a standard queue.When building a message consumer you need to handle the various errors that will inevitably occur during message processing. The dead-letter queue of a FIFO queue must also be a FIFO queue. To allow more than 10 source queues to specify dead-letter queues, set the redrivePermission parameter to allowAll. You can specify up to 10 source queue ARNs. You can specify this parameter only when the redrivePermission parameter is set to byQueue. SourceQueueArns – The Amazon Resource Names (ARN)s of the source queues that can specify this queue as the dead-letter queue and redrive messages. Valid values are:ĪllowAll – (Default) Any source queues in this Amazon Web Services account in the same Region can specify this queue as the dead-letter queue.ĭenyAll – No source queues can specify this queue as the dead-letter queue.īyQueue – Only queues specified by the sourceQueueArns parameter can specify this queue as the dead-letter queue. RedrivePermission – The permission type that defines which source queues can specify the current queue as the dead-letter queue. RedriveAllowPolicy – The string that includes the parameters for the permissions for the dead-letter queue redrive permission and which source queues can specify dead-letter queues as a JSON object. When the ReceiveCount for a message exceeds the maxReceiveCount for a queue, Amazon SQS moves the message to the dead-letter-queue. MaxReceiveCount – The number of times a message is delivered to the source queue before being moved to the dead-letter queue. The parameters are as follows:ĭeadLetterTargetArn – The Amazon Resource Name (ARN) of the dead-letter queue to which Amazon SQS moves messages after the value of maxReceiveCount is exceeded. RedrivePolicy – The string that includes the parameters for the dead-letter queue functionality of the source queue as a JSON object. The following attributes apply only to dead-letter queues: For more information about the visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide. Valid values: An integer from 0 to 43,200 (12 hours). VisibilityTimeout – The visibility timeout for the queue, in seconds. Valid values: An integer from 0 to 20 (seconds). ReceiveMessageWaitTimeSeconds – The length of time, in seconds, for which a ReceiveMessage action waits for a message to arrive. For more information about policy structure, see Overview of Amazon Web Services IAM Policies in the Identity and Access Management User Guide. Changes made to the MessageRetentionPeriod attribute can take up to 15 minutes and will impact existing messages in the queue potentially causing them to be expired and deleted if the MessageRetentionPeriod is reduced below the age of existing messages. When you change a queue’s attributes, the change can take up to 60 seconds for most of the attributes to propagate throughout the Amazon SQS system. Valid values: An integer representing seconds, from 60 (1 minute) to 1,209,600 (14 days). MessageRetentionPeriod – The length of time, in seconds, for which Amazon SQS retains a message. Valid values: An integer from 1,024 bytes (1 KiB) up to 262,144 bytes (256 KiB). MaximumMessageSize – The limit of how many bytes a message can contain before Amazon SQS rejects it. Valid values: An integer from 0 to 900 (15 minutes). The following lists the names, descriptions, and values of the special request parameters that the SetQueueAttributes action uses:ĭelaySeconds – The length of time, in seconds, for which the delivery of all messages in the queue is delayed. The URL of the Amazon SQS queue whose attributes are set. set_queue_attributes ( QueueUrl = 'string', Attributes = ) Parameters : ![]()
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