AWS sqs界面歧义参数

An Amazon SQS message has three basic states:

1. Sent to a queue by a producer.

2. Received from the queue by a consumer.

3. Deleted from the queue.

A message is considered to be stored after it is sent to a queue by a producer, but not yet received from the queue by a consumer (that is, between states 1 and 2). There is no limit to the number of stored messages. A message is considered to be in flight after it is received from a queue by a consumer, but not yet deleted from the queue (that is, between states 2 and 3). There is a limit to the number of inflight messages.

Messages in flight：between states 2 and 3  （传输中的消息）

Messages available：between states 1 and 2  （可用消息）