How far can you go without a message queue?

Re:How far can you go without a message queue? by mhuffman on Thursday August 25, 2022 @09:20AM (#32593336)

I mean, at some point you have to consider something a "proper" message queue. Otherwise, at the lower extreme your web server would act as a message queue.

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Re:How far can you go without a message queue? by shapefrog on Thursday August 25, 2022 @09:50AM (#32593694)

"Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and message broker"

Lets draw the line somewhere the other side of applications that advertise themselves as having that function?

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Re:How far can you go without a message queue? by Spivak on Thursday August 25, 2022 @06:18PM (#32600656)

The number of people that think that Redis is a KV store and nothing else is too damn high.

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Re:How far can you go without a message queue? by skyde on Friday August 26, 2022 @02:11AM (#32603875)

Redis is not a database. it doesn’t have proper transaction support.

it’s basically a cache with a fancy API so you can incrementally update data structure instead of having to constantly write the whole thing you are trying to cache.

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Re:How far can you go without a message queue? by Spivak on Friday August 26, 2022 @11:20AM (#32608676)

Sure it is! Redis is even fully ACID if you use the right persistence settings complete with transactions support and a WAL. You can even set up locking to abort/rollback transactions. In DB parlance Redis’ isolation level is strict serializability which is stronger than Postgres.

If you mean “it doesn’t have every feature of Postgres” and behaves a little differently then sure but it absolutely is a database.

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Re:How far can you go without a message queue? by skyde on Monday August 29, 2022 @01:31PM (#32640980)

the only way to do an "atomic increment operation" is to use the "Watch" command or to write stored procedure.

Watch is a poor man transaction and stored procedure does not work when you need to read value interactively from somewhere else (user/filesystem/another database) while inside a transaction.

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Re:How far can you go without a message queue? by Spivak on Tuesday August 30, 2022 @06:44PM (#32656120)

You're literally describing INCR, it's atomic. But I know what you mean, you want atomic GET then SET which is done by WATCH.

I don't disagree with you about WATCH being less powerful than PG transactions. SQLite data types are less powerful than PG types but it's still a database.

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