Well how 'bout locking/unlocking those tables to prevent this from happening ?

Dunno. Maybe that'd work. But if a module's users have to even consider adding such things, then it doesn't bode well for ...

... that it probably is a good module.

A pretty basic requirement of a "reliable job queue", is that once you take a job out of the queue, nobody else will be able to.

Even ignoring the complexity problems of the implementation, I think that using an RDBMS as the basis of a distributed queue is fraught with problems architecturally speaking. RDBMSs are designed to be servers in a client-server world; supreme masters of the data they control; responsible only for ensuring the total coherency of that data at all times.

Whilst the big boys -- Oracle, IBM, MS et al -- have add-ons for running their RDBMSs on clusters, they only achieve reliability by throwing multiply redundant high-availability hardware at the problem. Running one of the lesser-mortal free RDBMSs on commodity hardware is never going to achieve reliability.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re^4: Using TheSchwartz - 2 threads pick the same jobs. Any help ? by BrowserUk
in thread Using TheSchwartz - 2 threads pick the same jobs. Any help ? by gube

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