043d2dfb30
Seastar module update ``` 9c07020a Merge 'http: Introduce retry strategy machinery for http client (take two)' from Ernest Zaslavsky 58404b81 http: check for abort at start of `make_request` 35a9e086 http: support per-call `retry_strategy` in `make_request` 96538b92 http: integrate `retry_strategy` into HTTP client 77c3ba14 http: initial implementation of `retry_strategy` b9b9e7bf memory: Call finish_allocation() at the end of allocate_aligned() 2052c200 Merge 'file: coroutinize some functions' from Avi Kivity 7b65e50c file: reindent after coroutinization 837f64b5 file: coroutinize dma_read_impl() 9220607b file: coroutinize dma_read_exactly_impl() d1414541 file: coroutinize set_lifetime_hint_impl() 94d8fd08 file: coroutinize get_lifetime_hint_impl() 392efff4 file: coroutinize maybe_read_eof() e68a3173 file: do_dma_read_bulk: remove "rstate" local 14ac42cd file: coroutinize do_dma_read_bulk() 5446cbab net: Use future::then_unpack() helper to unpack tuples 9e88c4d8 posix-stack: Initialize unique_ptr-s with new result directly 51fb302e rpc: connection::process() use structured binding be2c2b54 http: Explicitly deprecate request::content ``` Closes scylladb/scylladb#26342
Scylla
What is Scylla?
Scylla is the real-time big data database that is API-compatible with Apache Cassandra and Amazon DynamoDB. Scylla embraces a shared-nothing approach that increases throughput and storage capacity to realize order-of-magnitude performance improvements and reduce hardware costs.
For more information, please see the ScyllaDB web site.
Build Prerequisites
Scylla is fairly fussy about its build environment, requiring very recent versions of the C++23 compiler and of many libraries to build. The document HACKING.md includes detailed information on building and developing Scylla, but to get Scylla building quickly on (almost) any build machine, Scylla offers a frozen toolchain. This is a pre-configured Docker image which includes recent versions of all the required compilers, libraries and build tools. Using the frozen toolchain allows you to avoid changing anything in your build machine to meet Scylla's requirements - you just need to meet the frozen toolchain's prerequisites (mostly, Docker or Podman being available).
Building Scylla
Building Scylla with the frozen toolchain dbuild is as easy as:
$ git submodule update --init --force --recursive
$ ./tools/toolchain/dbuild ./configure.py
$ ./tools/toolchain/dbuild ninja build/release/scylla
For further information, please see:
- Developer documentation for more information on building Scylla.
- Build documentation on how to build Scylla binaries, tests, and packages.
- Docker image build documentation for information on how to build Docker images.
Running Scylla
To start Scylla server, run:
$ ./tools/toolchain/dbuild ./build/release/scylla --workdir tmp --smp 1 --developer-mode 1
This will start a Scylla node with one CPU core allocated to it and data files stored in the tmp directory.
The --developer-mode is needed to disable the various checks Scylla performs at startup to ensure the machine is configured for maximum performance (not relevant on development workstations).
Please note that you need to run Scylla with dbuild if you built it with the frozen toolchain.
For more run options, run:
$ ./tools/toolchain/dbuild ./build/release/scylla --help
Testing
See test.py manual.
Scylla APIs and compatibility
By default, Scylla is compatible with Apache Cassandra and its API - CQL. There is also support for the API of Amazon DynamoDB™, which needs to be enabled and configured in order to be used. For more information on how to enable the DynamoDB™ API in Scylla, and the current compatibility of this feature as well as Scylla-specific extensions, see Alternator and Getting started with Alternator.
Documentation
Documentation can be found here. Seastar documentation can be found here. User documentation can be found here.
Training
Training material and online courses can be found at Scylla University. The courses are free, self-paced and include hands-on examples. They cover a variety of topics including Scylla data modeling, administration, architecture, basic NoSQL concepts, using drivers for application development, Scylla setup, failover, compactions, multi-datacenters and how Scylla integrates with third-party applications.
Contributing to Scylla
If you want to report a bug or submit a pull request or a patch, please read the contribution guidelines.
If you are a developer working on Scylla, please read the developer guidelines.
Contact
- The community forum and Slack channel are for users to discuss configuration, management, and operations of ScyllaDB.
- The developers mailing list is for developers and people interested in following the development of ScyllaDB to discuss technical topics.