Re: Multiple instances and background batch threads.
Re: Multiple instances and background batch threads.
- Subject: Re: Multiple instances and background batch threads.
- From: Andrew Lindesay <email@hidden>
- Date: Thu, 9 Oct 2008 13:07:33 +1300
Hello Quinton;
You could perhaps have a DA invoked using "curl" from crontab which
then enqueues a request into a messaging server. The request could
then be consumed by a "singleton reader" to ensure the requests were
dealt with serially? I guess this doesn't support redundancy.
Otherwise I would use a database table as a lock that manually-
implements optimistic locking to avoid concurrency issues.
cheers.
I have a scenario where I need my application to periodically fire
off background batch tasks in a separate thread, but only need one
of the possible instances to perform this task at any given
interval. What technique do people normally use with WO to perform
this sort of election/locking between instances so that only one of
them at a time ever attempts to do the work?
___
Andrew Lindesay
www.lindesay.co.nz
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