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3e70ae1d06
If the compaction manager is started, compactions may start (this is regardless of whether or not we trigger them). The problem with that is that they start at a time in which we are flushing the commitlog and the initialization procedure waits for the commitlog to be fully flushed and the resulting memtables flushed before we move on. Because there are no incoming writes, the amount of shares in memtable flushes decrease as memory used decreases and that can cause the startup procedure to take a long time. We have recently started to bump the shares manually for manual flushes. While that guarantees that we will not drive the shares to zero, I will make the argument that we can do better by making sure that those things are, at this point, running alone: user experience is affected by startup times and the bump we give to user-triggered operations will only do so much. Even if we increase the shares a lot flushes will still be fighting for resources with compactions and startup will take longer than it could. By making sure that flushes are this point running alone we improve the user experience by making sure the startup is as fast as it can be. There is a similar problem at the drain level, which is also fixed in this series. Fixes #3958 * git@github.com:glommer/scylla.git faster-restart compaction_manager: delay initialization of the compaction manager. drain: stop compactions early
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>