[Doc] Stateful functions don't work in standalone mode since PIP-117

[mouton0815]

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• I searched in the issues and found nothing similar.

What issue do you find in Pulsar docs?

Since the simplifications done with PIP-117, it is no longer possible to use stateful functions in standalone mode.

It seems the only way out is to run the old setup with Zookeeper:

PULSAR_STANDALONE_USE_ZOOKEEPER=1 bin/pulsar standalone

This is however not documented, not here: https://pulsar.apache.org/docs/4.0.x/getting-started-standalone/ and not there: https://pulsar.apache.org/docs/4.0.x/functions-worker-stateful/. This makes life difficult for Pulsar newcomers.

What is your suggestion?

My proposal would be to mention the need for PULSAR_STANDALONE_USE_ZOOKEEPER=1 in standalone mode in section https://pulsar.apache.org/docs/4.0.x/functions-worker-stateful/.

However, the perfect solution would be to always support stateful functions by just running bin/pulsar standalone ... but that's beyond documentation.

Any reference?

PIP-117

Are you willing to submit a PR?

• I'm willing to submit a PR!