This error can arise in two cases:
- you are using an a recent trunk version (not the latest) which has a bug
- you are using the latest trunk (no bug) but you have a duplicated
connection in your code:
db = DAL(....)
db = DAL(....)
perhaps in different model files. Previous web2py did not check and allowed
you to have two connections to the same database. We found this is often
source or errors. The new web2py checks and does not allow you to do it.
Your would get the error you see.
On Thursday, 4 October 2012 14:42:59 UTC-5, Adi wrote:
>
> We promoted latest night build to production, and scheduler started
> failing. At the same time there were some code changes, so I'm having a
> hard time tracing the source of the problem.
>
> Any insights while I'm trying to figure it out?
>
> Thanks,
> Adi
>
> db: mysql
> redhat linux
> w2p: Version 2.0.9 (2012-10-02 03:55:58) dev
>
> scheduler_run table: traceback field:
> Traceback (most recent call last):
> File "/opt/web-apps/web2py/gluon/scheduler.py", line 203, in executor
> _env = env(a=a,c=c,import_models=True)
> File "/opt/web-apps/web2py/gluon/shell.py", line 134, in env
> sys.exit(1)
> SystemExit: 1
>
>
> scheduler log:
> /opt/web-apps/web2py/gluon/dal.py:6597: DeprecationWarning:
> object.__new__() takes no parameters
> db = super(DAL, cls).__new__(cls, uri, *args, **kwargs)
> web2py Web Framework
> Created by Massimo Di Pierro, Copyright 2007-2012
> Version 2.0.9 (2012-10-02 03:55:58) dev
> Database drivers available: SQLite(sqlite3), MySQL(pymysql),
> PostgreSQL(pg8000), IMAP(imaplib)
> starting single-scheduler for "crm"...
> Traceback (most recent call last):
> File "/opt/web-apps/web2py/gluon/restricted.py", line 209, in restricted
> exec ccode in environment
> File "applications/crm/models/db.py", line 47, in <module>
> db =
> DAL('mysql://crm:password@localhost:3307/CRM',migrate_enabled=False,
> fake_migrate_all=True)
> File "/opt/web-apps/web2py/gluon/dal.py", line 6595, in __new__
> raise RuntimeError, 'Cannot duplicate a Singleton'
> RuntimeError: Cannot duplicate a Singleton
>
>
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