SQS ApproximateNumberOfMessages 属性是否包括延迟和不可见的消息？

Question

我目前正在使用 AWS 的 SQS。每隔 60 秒，我的应用程序就会从队列中提取所有消息并进行处理。鉴于我只能在单个请求中检索最多 10 条消息，我想查询 ApproximateNumberOfMessages 的队列。队列中的近似消息数决定了我需要调用 SQS 多少次才能检索队列中的所有消息。

当我向 SQS 查询队列属性时，我得到：

{
  '$metadata': {
    httpStatusCode: 200,
    requestId: '...',
    extendedRequestId: undefined,
    cfId: undefined,
    attempts: 1,
    totalRetryDelay: 0
  },
  Attributes: {
    QueueArn: 'arn:...',
    ApproximateNumberOfMessages: '0',           <--- helpful
    ApproximateNumberOfMessagesNotVisible: '0', <--- is this attribute included in the `ApproximateNumberOfMessages`
    ApproximateNumberOfMessagesDelayed: '0',    <--- is this attribute included in the `ApproximateNumberOfMessages`
    CreatedTimestamp: '1641925448',
    LastModifiedTimestamp: '1641925448',
    VisibilityTimeout: '30',
    MaximumMessageSize: '262144',
    MessageRetentionPeriod: '345600',
    DelaySeconds: '90',
    RedrivePolicy: '{"deadLetterTargetArn":"arn:...","maxReceiveCount":4}',
    ReceiveMessageWaitTimeSeconds: '0',
    SqsManagedSseEnabled: 'false'
  }
}

如上面的代码块所示，ApproximateNumberOfMessagesNotVisible 和 ApproximateNumberOfMessagesDelayed 是否包含在 ApproximateNumberOfMessages 值中？

Answer 1

不，它们不包括在内。 ApproximateNumberOfMessages为当前可重试的消息数：

The number of messages available for retrieval from the queue.

同样对于标准队列，这些值只是近似值，可能不代表存在的实际消息数：

For standard queues, the result is approximate because of the distributed architecture of Amazon SQS.

SQS ApproximateNumberOfMessages 属性是否包括延迟和不可见的消息？

Does the SQS ApproximateNumberOfMessages attribute include the delayed and not visible messages?

amazon-web-services

amazon-sqs