AWS SQS - polling

Short polling

• might just receive a subset of messages in the queue

Long polling (recommended)

• Frequency is lower compare to short polling, and long polling waits longer

• When WaitTime is greater than 0, long polling is in effect

• Long-poll requests wait up to 20 seconds for the next message to arrive when the queue is empty - prevent from keep polling empty queue

• Still return when a message is available (it just waits longer for a available message)

• Save cost as long as consumers can wait a bit

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