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  1. C++ Driver
  2. CXX-2278

[ChangeStream] Why does iterating change stream block and how to avoid it

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    • Task
    • Status: Closed
    • Unknown
    • Resolution: Gone away
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    Description

      Hello,

      I am trying to use change streams and this code snippet is blocking:

      for (const auto& event : stream)
      {
          handleEvent(event);
      }
      

      I run the above code periodically on different streams. But I see that stream iteration blocks when it is empty and I am not able to break out of this loop if that happens. Why is that the case? How can I read all available events in the stream and not be blocked? I cannot use a break; since I don't know before reading the stream how many events are in there.

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              kevin.albertson@mongodb.com Kevin Albertson
              puya@motionmetrics.com Puya Daravi
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