[GitHub] [pulsar] hansenc opened a new issue #7732: Function created but not called

[GitBox <gi...@apache.org>]

hansenc opened a new issue #7732:
URL: https://github.com/apache/pulsar/issues/7732


   **Describe the bug**
   When I create a function (standalone, Java runtime) and start producing to the function's input topic, I can see that an instance of the function is created in the logs, but the function seems to never be called. Weirdly, if I trigger the function before producing to the input topic, the function is called as expected. I've created a (somewhat) minimal [test project](https://github.com/hansenc/pulsar-scratch) to reproduce this issue. I suspect user error, but I can't figure out what I'm doing wrong.
   
   **To Reproduce**
   Steps to reproduce the behavior:
   1. Clone the test project [here](https://github.com/hansenc/pulsar-scratch)
   2. `mvn clean package`
   3. Run `com.github.hansenc.pulsar.FunctionIT` (from an IDE or otherwise)
   4. Notice that `testWithTrigger()` passes while `testWithoutTrigger()` hangs, with the only difference being a call to `pulsar-admin functions trigger...`
   
   **Expected behavior**
   I expect the function to be called as messages show up in its input topic without needing to 'trigger' it first.
   
   **Desktop (please complete the following information):**
    - OS: macOS
   
   **Additional context**
   I've tried this with Pulsar version 2.6.0 and 2.5.2 with the same result.
   


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