m-trieu opened a new pull request, #32774:
URL: https://github.com/apache/beam/pull/32774
Start and closing Windmill streams are currently via `halfClose()` and on
stream creation. Implementations were previously created and returned in a
"started" state usually after the stream has already sent the initial headers
to open the connection to the backend servers.
Starting in the current state prevents us from being able to start the
stream "lazily". And closing allows other blocking stream operations to
prevent streams from being able to be closed (stalling at times up to 10-20
minutes).
- Add start() flexibility to the WindmillStream API by allowing external
callers to start the stream themselves.
- Add shutdown() capability to allow the stream to receive a shutdown
signal, that is idempotent and does not block (or is blocked by) other blocking
stream operations.
This is especially important in direct path mode where the user worker
manages the fan out to the backend.
in terms of implementation, similar to WindmillStream.shutdown(),
WindmillStream.start()'s behavior will only execute once during the lifetime of
the WindmillStream object. Subsequent calls to start() and shutdown() will do
nothing.
R: @arunpandianp @scwhittle
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