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At some points while bootstrapping [1], new non-seed Scylla nodes wait for schema agreement among all known endpoints in the cluster. The check for schema agreement was in `service::migration_manager::is_ready_for_bootstrap`. This function would return `true` if, at the time of its invocation, the node was aware of at least one `UP` peer (not itself) and that all `UP` peers had the same schema version as the node. We wish to re-use this check in the `auth` sub-system to ensure that the schema for internal system tables used for access-control have propagated to the entire cluster. Unlike in `service/storage_service.cc`, where `is_ready_for_bootstrap` was only invoked for seed nodes, we wish to wait for schema agreement for all nodes regardless of whether or not they are seeds. For a single-node cluster with itself as a seed, `is_ready_for_bootstrap` would always return `false`. We therefore change the conditions for schema agreement. Schema agreement is now reached when there are no known peers (so the endpoint map of the gossiper consists only of ourselves), or when there is at least one `UP` peer and all `UP` peers have the same schema version as us. This change should not impact any bootstrap behavior in `storage_service` because seed nodes do not invoke the function and non-seed nodes wait for peer visibility before checking for schema agreement. Since this function is no longer checking for schema agreement only in the context of bootstrapping non-seed nodes, we rename it to reflect its generality. [1] http://thelastpickle.com/blog/2017/05/23/auto-bootstrapping-part1.html
Scylla
Quick-start
$ git submodule update --init --recursive
$ sudo ./install-dependencies.sh
$ ./configure.py --mode=release
$ ninja-build -j4 # Assuming 4 system threads.
$ ./build/release/scylla
$ # Rejoice!
Please see HACKING.md for detailed information on building and developing Scylla.
Running Scylla
- Run Scylla
./build/release/scylla
- run Scylla with one CPU and ./tmp as data directory
./build/release/scylla --datadir tmp --commitlog-directory tmp --smp 1
- For more run options:
./build/release/scylla --help
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>