What is everyone using for distributed locks in lo...
# cfml-generale
emmet
05/07/2025, 4:30 PMWhat is everyone using for distributed locks in load balanced environments?
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bdw429s
05/07/2025, 5:30 PMRedis, in some cases
bdw429s
05/07/2025, 5:30 PMIdeally, avoiding distributed locks is best if possible š
bdw429s
05/07/2025, 5:31 PMIn some other projects, I use Couchbase, which has some different strategies for ensuring consistency for shared data
ā¢ via actual locking on the resource
ā¢ via CAS (compare and swap) semantics
bdw429s
05/07/2025, 5:31 PMIn your case, I'm not clear if you mean locking data across servers, or if you mean just single-threading code like how cflock works
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emmet
05/07/2025, 5:31 PMI've gotten away without them for this long. I started writing a wrapper for https://github.com/awslabs/amazon-dynamodb-lock-client
emmet
05/07/2025, 5:32 PMcflock for clusters
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emmet
05/07/2025, 5:33 PMsingle threading a very busy api
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bdw429s
05/07/2025, 5:40 PMGot it. And I would encourage you to ask yourself whether it's absolutely necessary to lock. Locking is the enemy of throughput in a concurrent environment!
bdw429s
05/07/2025, 5:40 PMSometimes there are ways to work around it, depending on what you're locking, and for what reason.
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emmet
05/07/2025, 5:41 PMIts not for overuse. just a specific sync operation that has a race condition about once every 2 years.
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bdw429s
05/07/2025, 5:41 PMFor example, if rebuilding a cache, rebuild it async while the nodes still serve the outdated version. Then swap the new cache when it's ready, etc
bdw429s
05/07/2025, 5:42 PMhas a race condition about once every 2 years.Man, how do I get requirements like that?? š
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emmet
05/07/2025, 5:43 PMyeah, its not terrible thing which is why i've revisited this for about 8 years now and never put a plan in place.
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emmet
05/07/2025, 5:44 PMI use dynamoDB streams a lot and just came across that library and it reminded me.
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zackster
05/07/2025, 7:17 PMLucee's redis extension has a battle tested distributed lock https://docs.lucee.org/reference/tags/distributedlock.html
zackster
05/07/2025, 7:19 PMzackster
05/07/2025, 7:20 PMhere's the test suite / demo https://github.com/lucee/extension-redis/blob/master/tests/DistributedLockTest.cfc
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lmajano
05/08/2025, 10:30 AMHere is another one: https://redis-cache.ortusbooks.com/essentials/usage/distributed-locking
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aliaspooryorik
05/08/2025, 3:03 PM
Also using JRedis (but on ACF), we also use setting a flag in a database on some operations which thrash external resources but newer stuff is all jedis
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emmet
05/08/2025, 4:16 PMThanks everyone. I'm gonna give some of these a try over the weekend.
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