当队列中没有消息时，拉取速度极慢

Question

我将 pubsub 与 Gmail 一起用于推送通知。

pubsub 订阅按预期接收消息。

然而，当我提取消息时，我注意到如果没有要提取的消息，获得响应的延迟会非常慢。

如果至少有 1 条消息需要拉取，那么响应是及时的

有没有其他人遇到过这种情况？

我唯一能想到的解决方法是在队列中留言。

if (credential.RequestAccessTokenAsync(CancellationToken.None).Result)
{
    var pubsubSerivce = new Google.Apis.Pubsub.v1beta2.PubsubService(
    new BaseClientService.Initializer()
    {
        HttpClientInitializer = credential,
        ApplicationName = "iLink",
    });

    PullRequest pr = new PullRequest();
    pr.MaxMessages = 100;
    PullResponse prs = pubsubSerivce.Projects.Subscriptions.Pull(pr, "projects/vivid-canyon-90023/subscriptions/iLink").Execute();

    AcknowledgeRequest ak = new AcknowledgeRequest();

    if (prs != null && prs.ReceivedMessages != null)
    {                    
        ak.AckIds = new List<string>();
        string messageText = "";
        foreach (ReceivedMessage rm in prs.ReceivedMessages)
        {
            ak.AckIds.Add(rm.AckId);
            messageText += " | " + rm.Message.Data;
        }
        pubsubSerivce.Projects.Subscriptions.Acknowledge(ak, "projects/vivid-canyon-90023/subscriptions/iLink").Execute();
        Master.setSuccessPrompt("Pulled Total Meesage count of: " + prs.ReceivedMessages.Count + " | Data | " + messageText);
    }
    else
    {
        Master.setSuccessPrompt("No Messages to pull");
    }
}

Answer 1

这并不慢，只是挂起并等待任何消息。尝试使用 returnImmediately=true.

当队列中没有消息时，拉取速度极慢

Pull extremely slow when no messages on queue

google-cloud-pubsub