Retrieves one or more messages (up to 10), from the specified queue. Using the
WaitTimeSeconds parameter enables long-poll support. For more information, see
Amazon SQS Long Polling in the
Amazon SQS Developer Guide.
Short poll is the default behavior where a weighted random set of machines is sampled on a
ReceiveMessage call. Therefore, only the messages on the sampled machines are returned. If the number of messages in the queue is small (fewer than 1,000), you most likely get fewer messages than you requested per
ReceiveMessage call. If the number of messages in the queue is extremely small, you might not receive any messages in a particular
ReceiveMessage response. If this happens, repeat the request.
For each message returned, the response includes the following:
- The message body.
- An MD5 digest of the message body. For information about MD5, see RFC1321.
- The MessageId you received when you sent the message to the queue.
- The receipt handle.
- The message attributes.
- An MD5 digest of the message attributes.
The receipt handle is the identifier you must provide when deleting the message. For more information, see
Queue and Message Identifiers in the
Amazon SQS Developer Guide.
You can provide the
VisibilityTimeout parameter in your request. The parameter is applied to the messages that Amazon SQS returns in the response. If you don't include the parameter, the overall visibility timeout for the queue is used for the returned messages. The default visibility timeout for a queue is 30 seconds.
In the future, new attributes might be added. If you write code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.