Tailetc Alternatives
Similar projects and alternatives to tailetc
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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etcd
Distributed reliable key-value store for the most critical data of a distributed system
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sched
In-process Go Job Scheduler. Supports Fixed, Timely, and Cron Expression Intervals. Instrument and Expose Scheduler's Job Metrics.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
tailetc reviews and mentions
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Sched - In-process Go Job Scheduler. With Cron Support and Prometheus Metrics
https://github.com/tailscale/tailetc/blob/b2fa539c2383d30d03e0eea1052022af132dca9f/tailetc.go#L142
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An Unlikely Database Migration
Interesting choice of technology, but you didn't completely convince me to why this is better than just using SQLite or PostgreSQL with a lagging replica. (You could probably start with either one and easily migrate to the other one if needed.)
In particular you've designed a very complicated system: Operationally you need an etcd cluster and a tailetc cluster. Code-wise you now have to maintain your own transaction-aware caching layer on top of etcd (https://github.com/tailscale/tailetc/blob/main/tailetc.go). That's quite a brave task considering how many databases fail at Jepsen. Have you tried running Jepsen tests on tailetc yourself? You also mentioned a secondary index system which I assume is built on top of tailetc again? How does that interact with tailetc?
Considering that high-availability was not a requirement and that the main problem with the previous solution was performance ("writes went from nearly a second (sometimes worse!) to milliseconds") it looks like a simple server with SQLite + some indexes could have gotten you quite far.
We don't really get the full overview from a short blog post like this though so maybe it turns out to be a great solution for you. The code quality itself looks great and it seems that you have thought about all of the hard problems.
Stats
tailscale/tailetc is an open source project licensed under BSD 3-clause "New" or "Revised" License which is an OSI approved license.
The primary programming language of tailetc is Go.