Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2239
What if instead of changing how we start the daemon (so continue to always
start as a background process), we instead add a `wait` after the PID file has
been updated when starting a foreground process?
If FLINK-4212 is accepted we would also need to release the file lock
before calling `wait`.
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