litefs
gossip-glomers
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litefs | gossip-glomers | |
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38 | 12 | |
3,620 | 85 | |
3.4% | - | |
8.0 | 4.5 | |
3 months ago | about 1 year ago | |
Go | Go | |
Apache License 2.0 | - |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
litefs
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Handle Incoming Webhooks with LiteJob for Ruby on Rails
Firstly, LiteJob's reliance on SQLite inherently restricts its horizontal scaling capabilities. Unlike other databases, SQLite is designed for single-machine use, making it challenging to distribute workload across multiple servers. This can certainly be done using novel technologies like LiteFS, but it is far from intuitive.
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Experimenting on the Edge with Turso (and Go)
Im curious to know if others have tried out Turso or LiteFS or any of the newer edge db providers that are popping up in 'real world' applications and what your experiences have been?
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Skip the API, Ship Your Database
Author here. I think we could have set better expectations with our Postgres docs. It wasn't meant to be a managed service but rather some tooling to help streamline setting up a database and replicas. I'm sorry about the troubles you've had and that it's come off as us being disingenuous. We blog about things that we're working on and find interesting. It's not meant say that we've figured everything out but rather this is what we've tried.
As for this post, it's not managed SQLite but rather an open source project called LiteFS [1]. You can run it anywhere that runs Linux. We use it in few places in our infrastructure and found that sharing the underlying database for internal tooling was really helpful for that use case.
[1]: https://github.com/superfly/litefs
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SQLedge: Replicate Postgres to SQLite on the Edge
#. SQLite WAL mode
From https://www.sqlite.org/isolation.html https://news.ycombinator.com/item?id=32247085 :
> [sqlite] WAL mode permits simultaneous readers and writers. It can do this because changes do not overwrite the original database file, but rather go into the separate write-ahead log file. That means that readers can continue to read the old, original, unaltered content from the original database file at the same time that the writer is appending to the write-ahead log
#. superfly/litefs: aFUSE-based file system for replicating SQLite https://github.com/superfly/litefs
#. sqldiff: https://www.sqlite.org/sqldiff.html https://news.ycombinator.com/item?id=31265005
#. dolthub/dolt: https://github.com/dolthub/dolt
> Dolt can be set up as a replica of your existing MySQL or MariaDB database using standard MySQL binlog replication. Every write becomes a Dolt commit. This is a great way to get the version control benefits of Dolt and keep an existing MySQL or MariaDB database.
#. pganalyze/libpg_query: https://github.com/pganalyze/libpg_query :
> C library for accessing the PostgreSQL parser outside of the server environment
#. Ibis + Substrait [ + DuckDB ]
> ibis strives to provide a consistent interface for interacting with a multitude of different analytical execution engines, most of which (but not all) speak some dialect of SQL.
> Today, Ibis accomplishes this with a lot of help from `sqlalchemy` and `sqlglot` to handle differences in dialect, or we interact directly with available Python bindings (for instance with the pandas, datafusion, and polars backends).
> [...] `Substrait` is a new cross-language serialization format for communicating (among other things) query plans. It's still in its early days, but there is already nascent support for Substrait in Apache Arrow, DuckDB, and Velox.
#. benbjohnson/postlite: https://github.com/benbjohnson/postlite
> postlite is a network proxy to allow access to remote SQLite databases over the Postgres wire protocol. This allows GUI tools to be used on remote SQLite databases which can make administration easier.
> The proxy works by translating Postgres frontend wire messages into SQLite transactions and converting results back into Postgres response wire messages. Many Postgres clients also inspect the pg_catalog to determine system information so Postlite mirrors this catalog by using an attached in-memory database with virtual tables. The proxy also performs minor rewriting on these system queries to convert them to usable SQLite syntax.
> Note: This software is in alpha. Please report bugs. Postlite doesn't alter your database unless you issue INSERT, UPDATE, DELETE commands so it's probably safe. If anything, the Postlite process may die but it shouldn't affect your database.
#. > "Hosting SQLite Databases on GitHub Pages" (2021) re: sql.js-httpvfs, DuckDB https://news.ycombinator.com/item?id=28021766
#. awesome-db-tools https://github.com/mgramin/awesome-db-tools
- Fly.io Postgres cluster went down for 3 days, no word from them about it
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LiteFS Cloud: Distributed SQLite with Managed Backups
LiteFS works sorta like that. It provides read replicas on all your application servers so you can use it just like vanilla SQLite for queries.
Write transactions have to occur on the primary node but that's mostly because of latency. SQLite operates in serializable isolation so it only allows one transaction at a time. If you wanted to have all nodes write then you'd need to acquire a lock on one node and then update it and then release the lock. We actually allow this on LiteFS using something called "write forwarding" but it's pretty slow so I wouldn't suggest it for regular use.
We're adding an optional a query API over HTTP [1] soon as well. It's inspired by Turso's approach. That'll let you issue one or more queries in a batch over HTTP and they'll be run in a single transaction.
[1]: https://github.com/superfly/litefs/issues/326
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We Raised a Bunch of Money
Basically, LiteFS: https://github.com/superfly/litefs
And then some load balancer cleverness that reroutes writes to a specific VM: https://fly.io/blog/globally-distributed-postgres/
- Mycelite: SQLite extension to synchronize changes across SQLite instances
- Database suggestion to store and retrieve data
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Key-value store has been added to Deno API
But my guess is they'll have an alternate implementation or something like LiteFS in Deno Deploy that will make this substantially more interesting when running in the Cloud.
gossip-glomers
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Learning about distributed systems: where to start?
There's a nice-looking series of exercises from fly.io: https://fly.io/dist-sys/
(I haven't actually done them myself yet, but they look great. Not a standalone resource, but good for practice)
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Maelstrom: A workbench for learning distributed systems
Really worth noting that Maelstrom was the project they used to build the "Fly.io Distributed Systems Challenge" https://fly.io/dist-sys/ which was pretty popular at one point and discussed here, too. https://news.ycombinator.com/item?id=34897723
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Skip the API, Ship Your Database
LiteFS works similarly to async replication you'd find in Postgres or MySQL so it doesn't try to be as strict as something running a distributed consensus protocol like Raft. The guarantees for async replication are fairly loose so I'm not sure Jepsen testing would be useful for that per se.
On the LiteFS Cloud side, it currently does streaming backups so it has similar guarantees but we are expanding its feature set and I could see running Jepsen testing on that in the future. We worked with Kyle Kingsbury in the past on some distributed systems challenges[1] and he was awesome to work with. Would definitely love to engage with him again.
[1]: https://fly.io/dist-sys/
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Fly.io Postgres cluster went down for 3 days, no word from them about it
They have really good tech blog posts. Also, they have https://fly.io/dist-sys/
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Ask HN: Leetcode for Back End and Server Development
- https://hackattic.com/ : Interesting programming Problems.
- https://sadservers.com/ : Learn Linux by solving problems.
- https://fly.io/dist-sys/ : Distributed Systems Problems.
- https://github.com/pingcap/talent-plan/ : System Programming / Distributed System Challenge.
- https://protohackers.com/ : Server Programming Challenges.
- https://codecrafters.io/ : Implement server tech / softwares from scratch.
- https://hyperskill.org/ : Lots of projects based tutorials.
- https://fly.io/dist-sys/ : Distributed Systems Problems.
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zio-maelstrom
Gossip Glomers https://fly.io/dist-sys/ by fly.io is a great way to learn distributed systems. They are fun to solve challenges. zio-maelstrom helps you get started faster in Scala!
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Where can I learn in depth about distributed systems and distributed computing from a traditional computer science perspective?
There’s also this to practice https://fly.io/dist-sys/
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Am I screwed if I'm finding it really difficult to enjoy using HTML/CSS and JS?
Yeah no the embedded stuff is more a hobby, I'm interested professionally in stuff like what you said you're doing now in another comment, distributed systems and such. Infrastructure for cloud providers, that kind of thing. Right now I'm doing this distributed systems challenge series thing https://fly.io/dist-sys/ which should be cool to put on my github.
- Ask HN: Projects to do to get better at distributed systems
What are some alternatives?
litestream - Streaming replication for SQLite.
transcripts - Changelog episode transcripts in Markdown format 📚
sqlite-s3vfs - Python writable virtual filesystem for SQLite on S3
litevfs - LiteFS VFS SQLite extension for serverless environments
dqlite - Embeddable, replicated and fault-tolerant SQL engine.
maelstrom - A workbench for writing toy implementations of distributed systems.
mvsqlite - Distributed, MVCC SQLite that runs on FoundationDB.
talent-plan - open source training courses about distributed database and distributed systems
Bedrock - Rock solid distributed database specializing in active/active automatic failover and WAN replication
Phoenix - Peace of mind from prototype to production
marmot - A distributed SQLite replicator built on top of NATS
flyctl - Command line tools for fly.io services