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cloudamqp
lavinmq
Crystal2022–2026
cloudamqp / lavinmq

lavinmq

Ultra quick message queue and streaming server

5Distinct people
5Mentions
0Explicit recommenders
1KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

Ultra quick message queue and streaming server

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year5 dated mentions

Observed mentions: 2022-12-06 11:34:22 UTC to 2026-04-28 11:47:52 UTC.

0122022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments20222023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments20242025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC110
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC000
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC211
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC110
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC110

What Hacker News says

5 sources

Show HN: LavinMQ, an open-source message broker written in Crystal

Hi HN. I'm Carl, creator of LavinMQ. LavinMQ is an open-source message broker. AMQP 0-9-1, MQTT, HTTP and streaming. Single binary, minimal resource use. If you know RabbitMQ, it's that (but running on a fraction of hardware). We're the team behind CloudAMQP where we've hosted RabbitMQ for 14 years. Sometimes customers hit issues we couldn't fully explain / work around. So we built our own broker, in order to provide solutions where we previously couldn't (which is much easier when you control the full stack). It all started by me building an open-source AMQP proxy to handle short-lived connections for a customer, to avoid heavy connection churn on cpu. Once the protocol was implemented, adding a persistence layer seemed like a fun challenge. How hard could it be? Turns out the protocol was the easy part. Reliable disk storage, ack handl
Read the rest
ing, and replication was harder. It took years. Our first release was pushed in 2020 and today it runs on 5,000+ production instances on CloudAMQP. LavinMQ is written in Crystal (LLVM-compiled, Go-like concurrency, Ruby-like syntax). Messages go straight to disk via memory-mapped files, no in-memory cache. Append-only writes for both messages and acks. The whole design is built around minimizing memory copies, allocations and syscalls. Numbers: ~580k msgs/sec on a t4g.micro (2 vCPU, 1 GB RAM). Over 1M msgs/sec on a c8g.large (2 vCPU, 4 GB). Try it: docker run -p 15672:15672 -p 5672:5672 cloudamqp/lavinmq We are curious to hear: how are you handling messaging today? What would make you consider switching broker?
16 points · Open discussion
rahil627·Mar 26, 2025Submission

Ask HN: What language do you use for performant web jobs and services?

it seems many big web projects (rails, django, etc. GIL langs) chose go(lang) to write "services" that could be separated. Yet, just about any language with quick execution, quick startup(?), concurrency (and/or parallelism), and a garbage-collecter would work: lisps, ocaml, haxe, nim, crystal, CLI langs (now /w AOT), JVM langs! I wonder what HN folks used. Was it a good choice? i was specifically thinking about crystal for rails, as i noticed a few interesting repos: mosquito, a job scheduler; fruit-juice, a ruby gem to enqueue jobs into mosquito (especially from rails); and lavinMQ, a successor of rabbitMQ(?). https://github.com/mosquito-cr/mosquito | https://github.com/crimson-knight/fruit_juice | https://github.com/cloudamqp/lavinmq/
1 points · Open discussion

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