Deployed web2py to production lately, keep getting an intermittent error
*"error: cannot
switch to a different thread"*. Please help.
- CentOS Linux release 7.4.1708
- web2py Version 2.16.1-stable+timestamp.2017.11.14.05.54.25
- Apache Version 2.4.33
- MySQL Version 10.1.30-MariaDB
- Python Version 2.7.15
Traceback (most recent call last):
File "/home/wesl/web2py/gluon/restricted.py", line 219, in restricted
exec(ccode, environment)
File "/home/wesl/web2py/applications/wesl/controllers/default.py", line
290, in <module>
File "/home/wesl/web2py/gluon/globals.py", line 419, in <lambda>
self._caller = lambda f: f()
File "/home/wesl/web2py/applications/wesl/controllers/default.py", line
50, in index
row = db(db.team).select()
File "/home/wesl/web2py/gluon/packages/dal/pydal/objects.py", line 2250,
in select
return adapter.select(self.query, fields, attributes)
File "/home/wesl/web2py/gluon/packages/dal/pydal/adapters/base.py", line
762, in select
return self._select_aux(sql, fields, attributes, colnames)
File "/home/wesl/web2py/gluon/packages/dal/pydal/adapters/base.py", line
718, in _select_aux
rows = self._select_aux_execute(sql)
File "/home/wesl/web2py/gluon/packages/dal/pydal/adapters/base.py", line
712, in _select_aux_execute
self.execute(sql)
File "/home/wesl/web2py/gluon/packages/dal/pydal/adapters/__init__.py",
line 67, in wrap
return f(*args, **kwargs)
File "/home/wesl/web2py/gluon/packages/dal/pydal/adapters/base.py", line
412, in execute
rv = self.cursor.execute(command, *args[1:], **kwargs)
File "/home/wesl/web2py/gluon/contrib/pymysql/cursors.py", line 166, in
execute
result = self._query(query)
File "/home/wesl/web2py/gluon/contrib/pymysql/cursors.py", line 322, in
_query
conn.query(q)
File "/home/wesl/web2py/gluon/contrib/pymysql/connections.py", line 835,
in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "/home/wesl/web2py/gluon/contrib/pymysql/connections.py", line 1019,
in _read_query_result
result.read()
File "/home/wesl/web2py/gluon/contrib/pymysql/connections.py", line 1302,
in read
first_packet = self.connection._read_packet()
File "/home/wesl/web2py/gluon/contrib/pymysql/connections.py", line 961,
in _read_packet
packet_header = self._read_bytes(4)
File "/home/wesl/web2py/gluon/contrib/pymysql/connections.py", line 988,
in _read_bytes
data = self._rfile.read(num_bytes)
File "/home/wesl/web2py/gluon/contrib/pymysql/_socketio.py", line 59, in
readinto
return self._sock.recv_into(b)
File "/home/wesl/lib/python2.7/site-packages/gevent/_socket2.py", line
330, in recv_into
self._wait(self._read_event)
File "src/gevent/_hub_primitives.py", line 265, in
gevent.__hub_primitives.wait_on_socket
File "src/gevent/_hub_primitives.py", line 266, in
gevent.__hub_primitives.wait_on_socket
File "src/gevent/_hub_primitives.py", line 252, in
gevent.__hub_primitives._primitive_wait
File "src/gevent/_hub_primitives.py", line 46, in
gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_hub_primitives.py", line 46, in
gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_hub_primitives.py", line 55, in
gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_waiter.py", line 151, in gevent.__waiter.Waiter.get
File "src/gevent/_greenlet_primitives.py", line 59, in
gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/_greenlet_primitives.py", line 59, in
gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/_greenlet_primitives.py", line 63, in
gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/__greenlet_primitives.pxd", line 35, in
gevent.__greenlet_primitives._greenlet_switch
error: cannot switch to a different thread
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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