e103ef3bcb
* seastar 1204efbc...ed7a0f54 (46): > gate: s/intgernal/internal/ > reactor: set reactor::_stopping to true on all shards > condition-variable: replace the coroutine wakeup task with a promise > tutorial: explain the buffer_size_t param of generator coroutine > log: call log_level_map explicitly in constructor > future: de-variadicate make_ready_future() and similar helpers > timer-set,scollectd: remove unnecessary ";" > util/conversion: remove inclusion guards > foreign_ptr: destroy: use run_in_background > abort_source, abortable_fifo: use is_nothrow_invocable_r_v<> > alien: add type constraint for alien::run_on and alien::submit_to > alien: add noexcept specifier for lambda passed to run_on() > test: alien_test: test alien::run_on() also > test: alien_test: throw if unexpected things happens > future: make API level 6 mandatory > api-level: update IDE fallback > core/on_internal_error: always log error with backtrace > future: make API level 5 mandatory > websocket: fix frame parsing. > websocket: fix frame assembling. > when_all: drop code for API_LEVEL < 4 > future: drop internal call_then_impl > future: when_all_succeed(): make API level 4 mandatory > reactor: trade comment for type constraints > sstring: s/is_invocable_r/is_invocable_r_v/ > doc: compatibility: document API levels 5 and 6 > demos: file_demo: pass a string_view to_open_file_dma() > TLS: Add issuer/subject info to verification error message > test: fstream_test: drop unnecessary API_LEVEL check > manual_clock: advance: use run_in_background to expire_timers > reactor: add run_in_backround and close > websocket: shutdown input first. > websocket: use gate to guard background tasks. > websocket: remove trailing spaces. > websocket_demo: ignore sleep_aborted exception. > websocket_demo: fix coredump. > fstream: drop API level 2 (make_file_output_stream() returning non-future) > core/sstring: do not use ostream_formatter > metrics: use fmt::to_string() when creating a label > backtrace: fix size calculation in dl_iterate_phdr > Downgrade expected stall detector warning to info > fix: Add missing inline code blocks > spawn_test: fix /bin/cat stuck in reading input. > reactor: pass fd opened in blocking mode to spawned process > reactor: skip sigaction if handler has been registered before. > reactor: allow registering handler multiple times for a signal.
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 community forum 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.