** Branch linked: lp:openobject-server/7.0
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https://bugs.launchpad.net/bugs/1086396
Title:
ir.cron's lock is discarded by scheduled jobs performing batch
transactions, wreaking havoc
Status in OpenERP Server:
Confirmed
Bug description:
Hello,
we discovered that the "mail" addon is sending some messages twice.
This is because the cron task "commits" the cursor after each message,
and it releases the lock which was acquired on "ir_cron" table.
# Try to grab an exclusive lock on the job row from within the task
transaction
"SELECT * FROM ir_cron WHERE id=%s FOR UPDATE NOWAIT"
So the same cron will be launched again without waiting the end of the
previous one. and the "search" will grab some mail.messages which are
already processed by the first job.
We just sent some thousands of e-mails, and we had few of them which
were sent twice.
The fix should be simple: do not use the main cursor to send the
e-mails.
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