Nadav Har'El da54d0fc7d Materialized views: fix accidental zeroing of flow-control delay
The materialized-views flow control carefully calculates an amount of
microseconds to delay a client to slow it down to the desired rate -
but then a typo (std::min instead of std::max) causes this delay to
be zeroed, which in effect completely nullifies the flow control
algorithm.

Before this fix, experiments suggested that view flow control was
not having any effect and view backlog not bounded at all. After this
fix, we can see the flow control having its desired effect, and the
view backlog converging.

Fixes #4143.

Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20190226161452.498-1-nyh@scylladb.com>
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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.

Note: See frozen toolchain for a way to build and run on an older distribution.

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>

Contributing to Scylla

Guidelines for contributing

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