b1821c773f
Now RPC module has some basic testing coverage to make sure RPC configuration is updated appropriately on configuration changes (i.e. `add_server` and `remove_server` are called when appropriate). The test suite currenty consists of the following test-cases: * Loading server instance with configuration from a snapshot. * Loading server instance with configuration from a log. * Configuration changes (remove + add node). * Leader elections don't lead to RPC configuration changes. * Voter <-> learner node transitions also don't change RPC configuration. * Reverting uncommitted configuration changes updates RPC configuration accordingly (two cases: revert to snapshot config or committed state from the log). A few more refactorings are made along the way to be able to reuse some existing functions from `replication_test` in `rpc_test` implementation. Please note, though, that there are still some functions that are borrowed from `replication_test` but not yet extracted to common helpers. This is mostly because RPC tests doesn't need all the complexity that `replication_test` has, thus, some helpers are copied in a reduced form. It would take some effort to refactor these bits to fit both `replication_test` and `rpc_test` without sacrificing convenience. This will probably be addressed in another series later. * manmanson/raft-rpc-tests-v9-alt3: raft: add tests for RPC module test: add CHECK_EVENTUALLY_EQUAL utility macro raft: replication_test: reset test rpc network between test runs raft: replication_test: extract tickers initialization into a separate func raft: replication_test: support passing custom `apply_fn` to `change_configuration()` raft: replication_test: introduce `test_server` aggregate struct raft: replication_test: support voter<->learner configuration changes raft: remove duplicate `create_command` function from `replication_test` raft: avoid 'using' statements in raft testing helpers header
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++20 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 APIs - CQL and Thrift. 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 users mailing list and Slack channel are for users to discuss configuration, management, and operations of the ScyllaDB open source.
- The developers mailing list is for developers and people interested in following the development of ScyllaDB to discuss technical topics.