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Merged pull request https://github.com/scylladb/scylla/pull/5567 from Calle Wilund: Fixes #5314 Instead of tying CDC handling into cql statement objects, this patch set moves it to storage proxy, i.e. shared code for mutating stuff. This means we automatically handle cdc for code paths outside cql (i.e. alternator). It also adds api handling (though initially inefficient) for batch statements. CDC is tied into storage proxy by giving the former a ref to the latter (per shard). Initially this is not a constructor parameter, because right now we have chicken and egg issues here. Hopefully, Pavels refactoring of migration manager and notifications will untie these and this relationship can become nicer. The actual augmentation can (as stated above) be made much more efficient. Hopefully, the stream management refactoring will deal with expensive stream lookup, and eventually, we can maybe coalesce pre-image selects for batches. However, that is left as an exercise for when deemed needed. The augmentation API has an optional return value for a "post-image handler" to be used iff returned after mutation call is finished (and successful). It is not yet actually invoked from storage_proxy, but it is at least in the call chain.
Scylla
Quick-start
To get the build going quickly, Scylla offers a frozen toolchain which would build and run Scylla using a pre-configured Docker image. Using the frozen toolchain will also isolate all of the installed dependencies in a Docker container. Assuming you have met the toolchain prerequisites, which is running Docker in user mode, building and running is as easy as:
$ ./tools/toolchain/dbuild ./configure.py
$ ./tools/toolchain/dbuild ninja build/release/scylla
$ ./tools/toolchain/dbuild ./build/release/scylla --developer-mode 1
Please see HACKING.md for detailed information on building and developing Scylla.
Note: GCC >= 8.1.1 is required to compile Scylla.
Running Scylla
- Run Scylla
./build/release/scylla
- run Scylla with one CPU and ./tmp as work directory
./build/release/scylla --workdir tmp --smp 1
- For more run options:
./build/release/scylla --help
Scylla APIs and compatibility
By default, Scylla is compatible with Apache Cassandra and its APIs - CQL and Thrift. There is also experimental support for the API of Amazon DynamoDB, but being experimental it needs to be explicitly enabled to be used. For more information on how to enable the experimental DynamoDB compatibility in Scylla, and the current limitations of this feature, see Alternator and Getting started with Alternator.
Documentation
Documentation can be found in ./docs and on the wiki. There is currently no clear definition of what goes where, so when looking for something be sure to check both. Seastar documentation can be found here. User documentation can be found here.
Building Fedora RPM
As a pre-requisite, you need to install Mock on your machine:
# Install mock:
sudo yum install mock
# Add user to the "mock" group:
usermod -a -G mock $USER && newgrp mock
Then, to build an RPM, run:
./dist/redhat/build_rpm.sh
The built RPM is stored in /var/lib/mock/<configuration>/result directory.
For example, on Fedora 21 mock reports the following:
INFO: Done(scylla-server-0.00-1.fc21.src.rpm) Config(default) 20 minutes 7 seconds
INFO: Results and/or logs in: /var/lib/mock/fedora-21-x86_64/result
Building Fedora-based Docker image
Build a Docker image with:
cd dist/docker
docker build -t <image-name> .
Run the image with:
docker run -p $(hostname -i):9042:9042 -i -t <image name>