702f6ee1b7
memtable flushes for system and regular region groups run under the
memtable_scheduling_group, but the controller adjusts shares based on
the occupancy of the regular region group.
It can happen that regular is not under pressure, but system is. In
this case the controller will incorrectly assign low shares to the
memtable flush of system. This may result in high latency and low
throughput for writes in the system group.
I observed writes to the sytem keyspace timing out (on scylla-2.3-rc2)
in the dtest: limits_test.py:TestLimits.max_cells_test, which went
away after this.
Fixes #3717.
Message-Id: <1535016026-28006-1-git-send-email-tgrabiec@scylladb.com>
(cherry picked from commit 10f6b125c8)
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>