Seastar
Scylla
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Seastar | Scylla | |
---|---|---|
25 | 19 | |
8,004 | 12,548 | |
1.4% | 2.6% | |
9.7 | 10.0 | |
4 days ago | about 8 hours ago | |
C++ | C++ | |
Apache License 2.0 | GNU Affero General Public License v3.0 |
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.
Seastar
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I want to share my latest hobby project, dbeel: A distributed thread-per-core nosql db written in rust
I used glommio as the async executor (instead of something like tokio), and it is wonderful. For people wondering whether it's "good enough" or to use C++ and seastar (as I have thought about a lot before starting this project), take the leap of faith, it's fast - both in terms of run time and to code.
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How much reason is there to be multi-threaded in the k8s environment
b) It's proven now e.g Seastar, Glommio that the fastest way to run a multi-threaded application is to have one instance with one thread pinned per CPU core. Then to have fibers/lightweight threads on top handling all of the asynchronous code. Your approach of lots of instances is the slowest so there will be a ton of unnecessary thread context-switching.
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Are You Sure You Want to Use MMAP in Your Database Management System?
The most common example is DPDK [1]. It's a framework for building bespoke networking stacks that are usable from userspace, without involving the kernel.
You'll find DPDK mentioned a lot in the networking/HPC/data center literature. An example of a backend framework that uses DPDK is the seastar framework [2]. Also, I recently stumbled upon a paper for efficient RPC networks in data centers [3].
If you want to learn more, the p99 conference by ScyllaDB has tons of speakers talking about some interesting challenges.
[1] https://www.dpdk.org/.
[2] https://github.com/scylladb/seastar
[3] https://github.com/erpc-io/eRPC
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Why does Actix-web's handler not require Send?
I assume Tokio itself, see e.g monoio or glommio, but also Seastar for C++.
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What is DPDK library in C and how to learn it?
https://core.dpdk.org/supported/ lists supported nics. You're best just reading material from the dpdk website for figuring out roughly what it is. It is used for a lot of different goals. For most web C++ stuff it's mainly used because you can avoid round trips of data passing through the kernel and can reference network data without tons of copying. For an example check out the SeaStar framework, https://seastar.io/, which is under the hood of ScyllaDB.
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How Numberly Replaced Kafka with a Rust-Based ScyllaDB Shard-Aware Application
As this is a Kafka sub, this may be a good opportunity to mention that Redpanda is based on the same framework (seastar) as Scylla. The idea of sharding work to CPU cores turns out to apply very well to the Kafka data model, too!
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What are some C++ projects with high quality code that I can read through?
Seastar which is a thread per core runtime written by the Scylla devs thats used in both Redpanda and Scylla as the underlying runtime. https://github.com/scylladb/seastar
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Abstraction Is Expensive
ScyllaDB is, ironically, maybe one of the worst examples the author could have come up with for "abstraction" in the article.
If folks aren't familiar with their work/internal tech, go check out some of their repos like Seastar. They have some of the most talented systems programmers on the planet writing thin veneers over kernel and hardware API's to squeeze every ounce out of performance.
https://github.com/scylladb/seastar
I know it's beside the point, but I just had to share because I thought that was funny
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Modern JVM Multithreading • Paweł Jurczenko • Devoxx Poland 2021
I’ve seen frameworks for c++ (https://seastar.io/) and rust (https://github.com/actix/actix) which support what you’re describing out of the box.
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Who is using C++ for web development?
If you're interested in scaling and asynchronous programming in c++ I highly recommend you investigate the SeaStar application framework. You wouldn't build a web service with SeaStar, rather you would build the infrastructure that you would use to build the web service on top of. https://github.com/scylladb/seastar
Scylla
- ScyllaDB: NoSQL data store using the seastar framework
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Database 101: How to Model Leaderboards for 1M Player's Game.
Then I decided to talk to my boss and ask him if I could work with the YARG guys and the condition was to create something cool enough to implement ScyllaDB (NoSQL Wide-column Database) since I'm working as a Developer Advocate there. You won't believe how the simplicity and scalability brought by ScyllaDB perfectly fit the needs of YARG.in!
- Potential for silent data loss on ScyllaDB 5.2.x
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Why ScyllaDB is Moving to a New Replication Algorithm: Tablets
ScyllaDB now has initial support for a new replication algorithm: tablets...
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What are some C++ projects with high quality code that I can read through?
Scylla which is a C++ implementation of the Cassandra distributed K:V store https://github.com/scylladb/scylladb
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Take Advantage of Git Rebase
What you say is impossible, we pretty successfully apply at ScyllaDB (see https://github.com/scylladb/scylladb/commits/master).
I'm not sure 100% of the commits compile & pass all tests - there may be some mistakes - but generally we're in a pretty good state, and the clean git log is being successfully used for bisecting.
If you want even larger scale - if I understand correctly, the Linux kernel practices a similar thing, which is where we got this practice from (ScyllaDB founders came from kernel development). And since Git was originally created to help developing Linux - that's where you want to look for good practices.
- Reducing logging cost by two orders of magnitude using CLP
- How Palo Alto Networks Replaced Kafka with ScyllaDB for Stream Processing
- Catch exceptions without even try-ing
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Databases inside or outside k8s cluster?
Examples: - Vitess - MySQL cluster - YugabyteDB - ScyllaDB - Couchbase - ArangoDB
What are some alternatives?
Folly - An open-source C++ library developed and used at Facebook.
Apache HBase - Apache HBase
glommio - Glommio is a thread-per-core crate that makes writing highly parallel asynchronous applications in a thread-per-core architecture easier for rustaceans.
Druid - Apache Druid: a high performance real-time analytics database.
Boost.Asio - Asio C++ Library
Apache Cassandra - Mirror of Apache Cassandra
Boost - Super-project for modularized Boost
OpenTSDB - A scalable, distributed Time Series Database.
ffead-cpp - Framework for Enterprise Application Development in c++, HTTP1/HTTP2/HTTP3 compliant, Supports multiple server backends
druid - A data-first Rust-native UI design toolkit.
Qt - Qt Base (Core, Gui, Widgets, Network, ...)
scylla-operator - The Kubernetes Operator for ScyllaDB