Josh Rosen created SPARK-2764:
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Summary: Simplify process structure of PySpark daemon / worker
launching process
Key: SPARK-2764
URL: https://issues.apache.org/jira/browse/SPARK-2764
Project: Spark
Issue Type: Improvement
Components: PySpark
Reporter: Josh Rosen
PySpark's daemon-based worker factory has a very complicated process structure
that I've always found confusing. The per-java-worker daemon.py process
launches a numCores-sized pool of subprocesses, and those subprocesses
launching the actual worker processes that process data.
I think we can simplify this by having daemon.py launch the workers directly
without this extra layer of indirection. See my comments on the pull request
that introduced daemon.py: https://github.com/mesos/spark/pull/563
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