HyukjinKwon commented on issue #24898: [SPARK-22340][PYTHON] Add a mode to pin Python thread into JVM's URL: https://github.com/apache/spark/pull/24898#issuecomment-545213380 Throwing an error or issuing a warning makes sense in a way it's not going to work when the thread is not pinned. One thing we should consider, though, even with pin threading, it has some issues with inheritable threadlocal for now - it cannot inherit the threadlocals (see the examples in the PR description). While it is at least easily able to work around with this pin-thread mode (e.g., manually inheriting it when it creates another thread), I am less sure if we should document this (or throw an warning without this pin-thread mode) at this moment ...
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