candlerb commented on a change in pull request #5531: Documentation updates, mainly for Python API URL: https://github.com/apache/pulsar/pull/5531#discussion_r341610766
########## File path: site2/docs/functions-develop.md ########## @@ -35,6 +35,20 @@ def process(input): ``` For complete code, see [here](https://github.com/apache/pulsar/blob/master/pulsar-functions/python-examples/native_exclamation_function.py). +Note that functions can be written in python2 or python3, but pulsar +currently only looks for "python" as the interpreter to execute them. + +A recent Ubuntu system may have only "python3" but not "python", in which +case functions will fail to start. As a workaround you can create a symlink, but beware this has some +[risks](https://askubuntu.com/questions/320996/how-to-make-python-program-command-execute-python-3#answer-475815): + +```bash +sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10 +``` + +If you choose to do this, be careful not to install any other package which +depends on "python" (2.x) Review comment: It could link to #5518 on github instead. Actually, I'm hoping #5518 will accept a new config option for setting the path to the python interpreter, in which case we would document that instead. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
