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e0bfd1c40a
Right now Cassandra SSTables with counters cannot be imported into Scylla. The reason for that is that Cassandra changed their counter representation in their 2.1 version and kept transparently supporting both representations. We do not support their old representation, nor there is a sane way to figure out by looking at the data which one is in use. For safety, we had made the decision long ago to not import any tables with counters: if a counter was generated in older Cassandra, we would misrepresent them. In this patch, I propose we offer a non-default way to import SSTables with counters: we can gate it with a flag, and trust that the user knows what they are doing when flipping it (at their own peril). Cassandra 2.1 is by now pretty old. many users can safely say they've never used anything older. While there are tools like sstableloader that can be used to import those counters, there are often situations in which directly importing SSTables is either better, faster, or worse: the only option left. I argue that having a flag that allow us to import them when we are sure it is safe is better than having no option at all. With this patch I was able to successfully import Cassandra tables with counters that were generated in Cassandra 2.1, reshard and compact their SSTables, and read the data back to get the same values in Scylla as in Cassandra. Signed-off-by: Glauber Costa <glauber@scylladb.com> Message-Id: <20190210154028.12472-1-glauber@scylladb.com>
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. Note: GCC >= 8.1.1 is require to compile 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>