[Koha-bugs] [Bug 18725] Process_message_queue sends duplicate emails if message_queue is not writable.

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=18725

Kyle M Hall <kyle at bywatersolutions.com> changed:

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--- Comment #6 from Kyle M Hall <kyle at bywatersolutions.com> ---
Created attachment 68602
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https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=68602&action=edit
Bug 18725 - Process_message_queue sends duplicate emails if message_queue is
not writable.

Last week, we had a database server whose disk filled, causing database writes
to fail.

This meant that messages in message_queue marked 'pending' were not marked as
'sent' when they were added to the postfix mail queue; messages were sent every
15 minutes (as specified in the cron job) until the disk space issues were
cleared.

I would suggest adding a token write to the start of process_message_queue.pl
as a 'canary in the coal mine'. If the database write fails,
process_message_queue should stop, because it's not safe to proceed sending
emails that may not be marked 'sent'.

I have no good idea on how to test this patch so this is what I've got:
Test Plan:
1) Apply this patch
2) prove t/db_dependent/Letters.t

Signed-off-by: Katrin Fischer <katrin.fischer.83 at web.de>

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