2h4dl commented on issue #80: multiprocessing pool hangs on join URL: https://github.com/apache/rocketmq-client-python/issues/80#issuecomment-569588034 Hi @messense, stacktrace is here with main process: ``` Process 31197: python3 json_edit_server.py Python v3.6.8 (/usr/local/python3.6.8/bin/python3.6) Thread 31197 (idle): "MainThread" select (selectors.py:376) serve_forever (socketserver.py:236) serve_forever (werkzeug/serving.py:734) inner (werkzeug/serving.py:966) run_simple (werkzeug/serving.py:1009) run (flask/app.py:990) <module> (json_edit_server.py:261) Thread 31344 (idle): "Dummy-2" _wait_for_tstate_lock (threading.py:1072) join (threading.py:1056) join (multiprocessing/pool.py:546) pic_edit (json_edit_server.py:122) process (json_edit_server.py:192) _on_message (rocketmq/client.py:385) Thread 3585 (idle): "Thread-30" _handle_workers (multiprocessing/pool.py:406) run (threading.py:864) _bootstrap_inner (threading.py:916) _bootstrap (threading.py:884) Thread 3586 (idle): "Thread-31" wait (threading.py:295) get (queue.py:164) _handle_tasks (multiprocessing/pool.py:415) run (threading.py:864) _bootstrap_inner (threading.py:916) _bootstrap (threading.py:884) Thread 3587 (idle): "Thread-32" _recv (multiprocessing/connection.py:379) _recv_bytes (multiprocessing/connection.py:407) recv (multiprocessing/connection.py:250) _handle_results (multiprocessing/pool.py:463) run (threading.py:864) _bootstrap_inner (threading.py:916) _bootstrap (threading.py:884) Thread 31345 (idle): "Dummy-1" _wait_for_tstate_lock (threading.py:1072) join (threading.py:1056) join (multiprocessing/pool.py:546) pic_edit (json_edit_server.py:122) process (json_edit_server.py:192) _on_message (rocketmq/client.py:385) Thread 7602 (idle): "Thread-33" _handle_workers (multiprocessing/pool.py:406) run (threading.py:864) _bootstrap_inner (threading.py:916) _bootstrap (threading.py:884) Thread 7603 (idle): "Thread-34" wait (threading.py:295) get (queue.py:164) _handle_tasks (multiprocessing/pool.py:415) run (threading.py:864) _bootstrap_inner (threading.py:916) _bootstrap (threading.py:884) Thread 7604 (idle): "Thread-35" _recv (multiprocessing/connection.py:379) _recv_bytes (multiprocessing/connection.py:407) recv (multiprocessing/connection.py:250) _handle_results (multiprocessing/pool.py:463) run (threading.py:864) _bootstrap_inner (threading.py:916) _bootstrap (threading.py:884) ```
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