For a new application, i have installed web2py 2.16.1 under python 3.6 and
using psycopg2 2.7.4 for postgresql access.
Everything is working okay, except the web2py scheduler.
After successfull execution of the first task, the scheduler gives an error
in the send_heartbeat function.
The task output is correctly stored in the database, with status COMPLETED.
The transaction is committed.
But then in the first heartbeat after completion, the error below is
thrown:
Looks like the database connection is lost unexpected.
The strange thing is that this is only happening with psycopg2. When the
PG8000 connector is used, everything is working fine.
I have tested this on my development system (MacBook)
On my production system under Ubuntu 16.04, the same thing is happening.
Does anyone have a clue?
The error:
ERROR:web2py.scheduler.MyMac.local#21060:Error retrieving status
Exception in thread Thread-30:
Traceback (most recent call last):
File "/Users/me/PycharmProjects/myapp/web2py/gluon/scheduler.py", line
1168, in send_heartbeat
mybackedstatus = db(sw.worker_name == self.worker_name).select().first()
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/objects.py",
line 2250, in select
return adapter.select(self.query, fields, attributes)
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/adapters/base.py",
line 762, in select
return self._select_aux(sql, fields, attributes, colnames)
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/adapters/base.py",
line 718, in _select_aux
rows = self._select_aux_execute(sql)
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/adapters/base.py",
line 712, in _select_aux_execute
self.execute(sql)
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/adapters/__init__.py",
line 67, in wrap
return f(*args, **kwargs)
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/adapters/base.py",
line 412, in execute
rv = self.cursor.execute(command, *args[1:], **kwargs)
psycopg2.OperationalError: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/threading.py",
line 916, in _bootstrap_inner
self.run()
File "/Users/me/PycharmProjects/myapp/web2py/gluon/scheduler.py", line
637, in run
self.send_heartbeat(counter)
File "/Users/me/PycharmProjects/myapp/web2py/gluon/scheduler.py", line
1239, in send_heartbeat
db.rollback()
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/base.py",
line 704, in rollback
self._adapter.rollback()
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/adapters/__init__.py",
line 56, in wrap
return f(*args, **kwargs)
File
"/Users/me/PycharmProjects/myapp/venv/lib/python3.6/site-packages/pydal/adapters/base.py",
line 865, in rollback
return self.connection.rollback()
psycopg2.InterfaceError: connection already closed
--
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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