大小为1的任务队列用于串行处理 [英] Task queue of size 1 for serial processing

问题描述

我想要一个只有一个任务可以一次处理的串行队列。这是我在queue.xml中的声明：

 < queue> 
<名称>南瓜< / name> 
< rate> 20 / s< / rate> 
< bucket-size> 1< / bucket-size> 
< max-concurrent-requests> 1< / max-concurrent-requests> 
< / queue> 
  

rate参数对此设置有任何影响吗？

我希望任务排队并且一次只处理一个任务。

谢谢

解决方案

队列速率和存储区大小不会同时限制任务进程的数量。看到这个答案，它比（当前）官方文档（您可能需要相应地重新访问您的配置）： https://stackoverflow.com/ a / 3740846/4495081

但是，您的 max-concurrent-requests 应确保只有一项任务根据文档执行：

您可以通过将max_concurrent_requests设置为
的较低值来避免这种可能性。例如，如果将max_concurrent_requests设置为10，
，则当延迟为0.3
秒时，我们的示例队列维护大约20个任务/秒。但是，当延迟时间超过0.5秒时，此
设置会限制处理速率，以确保不超过10个
任务同时运行。

I want a serial queue where only one task may process at a time. This is my declaration in queue.xml:

<queue>
    <name>pumpkin</name>
    <rate>20/s</rate>
    <bucket-size>1</bucket-size>
    <max-concurrent-requests>1</max-concurrent-requests>
</queue>

Does the "rate" parameter have any effect in this setup?

I want tasks to queue up and only process one at a time.

Thanks

解决方案

The queue rate and bucket size do not limit the number of tasks processes simultaneously. See this answer which captured a (now gone) official explanation of these configs better than the (current) official docs (you may want to revisit your configs accordingly): https://stackoverflow.com/a/3740846/4495081

However your max-concurrent-requests should ensure only one task is executed at a time, according to the docs:

You can avoid this possibility by setting max_concurrent_requests to a lower value. For example, if you set max_concurrent_requests to 10, our example queue maintains about 20 tasks/second when latency is 0.3 seconds. However, when the latency increases over 0.5 seconds, this setting throttles the processing rate to ensure that no more than 10 tasks run simultaneously.

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