Distributed lock management

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1

Since moving to a clustered environment, I noticed that is only aware of locks on the local node. Google turns up
a solution using Redis, but I wondered if anyone had suggestions from their
experience.

We use a datasource for session storage and include in our Application.cfc.

If we’re happy to throw an error in the case of a locking conflict, could
we implement our own solution by declaring a session variable, checking to
see if that variable exists before performing the code in the
block, then deleting the variable at the end of the block?

Thanks… Simon

2

Hi Simon,

so I guess you found this Github project from Ben Nadel GitHub - bennadel/CFRedlock: CFRedlock is a ColdFusion implementation of the Redlock distributed locking algorithm proposed by Redis.?
I can definitely recommend it, works great in our projects.

Cheers,
HarryVon: lucee@googlegroups.com [mailto:lucee@googlegroups.com] Im Auftrag von Simon Goldschmidt
Gesendet: Mittwoch, 13. Januar 2016 23:47
An: Lucee lucee@googlegroups.com
Betreff: [Lucee] Distributed lock management

Since moving to a clustered environment, I noticed that is only aware of locks on the local node. Google turns up a solution using Redis, but I wondered if anyone had suggestions from their experience.

We use a datasource for session storage and include in our Application.cfc.

If we’re happy to throw an error in the case of a locking conflict, could we implement our own solution by declaring a session variable, checking to see if that variable exists before performing the code in the block, then deleting the variable at the end of the block?

Thanks… Simon

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3

The alternative we’re looking at is to use the database to manage the
locking. We replace the with the following:

update customer set address=address where customer='#session.customerid#'

block of locked code goes here

The update doesn’t do anything but lock the rows of the database relevant
to the session, so this has the same effect as

Simon