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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Labels:None
It's no longer possible to reliably connect to Atlas clusters with Jython 2.7.0. Each SDAM monitor heartbeat fails with this error:
>>> Exception in thread pymongo_server_monitor_thread:Traceback (most recent call last): File "/Users/shane/jython2.7.0/Lib/threading.py", line 222, in _Thread__bootstrap self.run() File "/Users/shane/jython2.7.0/Lib/threading.py", line 213, in run self._target(*self._args, **self._kwargs) File "pymongo/periodic_executor.py", line 125, in _run if not self._target(): File "pymongo/monitor.py", line 46, in target monitor._run() File "pymongo/monitor.py", line 170, in _run self._server_description = self._check_server() File "pymongo/monitor.py", line 170, in _run self._server_description = self._check_server() File "pymongo/monitor.py", line 170, in _run self._server_description = self._check_server() File "pymongo/monitor.py", line 206, in _check_server return self._check_once() File "pymongo/monitor.py", line 206, in _check_server return self._check_once() File "pymongo/monitor.py", line 243, in _check_once response, round_trip_time = self._check_with_socket(sock_info) File "pymongo/monitor.py", line 274, in _check_with_socket response = conn._ismaster(cluster_time, None, None, None) File "pymongo/pool.py", line 579, in _ismaster doc = self.command('admin', cmd, publish_events=False, File "pymongo/pool.py", line 699, in command self._raise_connection_failure(error) File "pymongo/pool.py", line 683, in command return command(self, dbname, spec, slave_ok, File "pymongo/network.py", line 150, in command reply = receive_message(sock_info, request_id) File "pymongo/network.py", line 195, in receive_message length, _, response_to, op_code = _UNPACK_HEADER( File "pymongo/network.py", line 265, in _receive_data_on_socket wait_for_read(sock_info, deadline) File "pymongo/network.py", line 265, in _receive_data_on_socket wait_for_read(sock_info, deadline) File "pymongo/network.py", line 245, in wait_for_read readable = sock_info.socket_checker.select( File "pymongo/socket_checker.py", line 64, in select self._poller.unregister(sock) File "pymongo/socket_checker.py", line 57, in select res = self._poller.poll(timeout * 1000) File "/Users/shane/jython2.7.0/Lib/_socket.py", line 551, in poll result = self._handle_poll(partial(self.queue.poll, timeout_in_ns, TimeUnit.NANOSECONDS)) File "/Users/shane/jython2.7.0/Lib/_socket.py", line 525, in _handle_poll fd, event = self._event_test(notification) File "/Users/shane/jython2.7.0/Lib/_socket.py", line 500, in _event_test if mask & POLLHUP and (notification.hangup or not notification.sock.channel): AttributeError: 'SSLSocket' object has no attribute 'channel'
This appears to be a bug in Jython itself and is reproducible with Jython 2.7.0 and 2.7.1 and I've reported it here: https://bugs.jython.org/issue2900.
This PyMongo regression was caused by the changes in PYTHON-2123. Before those changes (PyMongo <3.11) this Jython bug would cause each TLS socket to be recreated each time SocketChecker.socket_closed was called. In practice this means that each SDAM connection is recreated for each heartbeat and each application socket that remains idle in the connection pool for >1 second is also closed and automatically reopened.
After PYTHON-2123, we use poll() to wait for a SDAM socket to be readable. This causes each heartbeat to fail with AttributeError: 'SSLSocket' object has no attribute 'channel' and marks the server Unknown.
In summary, SSL+Jython kind of worked before but is now totally broken. If we want to fix this, we can skip the poll() logic on Jython.
Edit: I've reported the bug to Jython here: https://bugs.jython.org/issue2900
- is caused by
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PYTHON-2123 Reduce Client Time To Recovery On Topology Changes
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- Closed
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- related to
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PYTHON-498 Investigate support for SSL in Jython 2.7
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- Closed
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