Nadav Har'El 5fc7b0507e alternator: fix bug in collection mutations
Alternator currently keeps an item's attributes inside a map, and we
had a serious bug in the way we build mutations for this map:

We didn't know there was a requirement to build this mutation sorted by
the attribute's name. When we neglect to do this sorting, this confuses
Scylla's merging algorithms, which assume collection cells are thus
sorted, and the result can be duplicate cells in a collection, and the
visible effect is a mutation that seems to be ignored - because both
old and new values exist in the collection.

So this patch includes a new helper class, "attribute_collector", which
helps collect attribute updates (put and del) and extract them in correctly
sorted order. This helper class also eliminates some duplication of
arcane code to create collection cells or deletions of collection cells.

This patch includes a simple test that previously failed, and one xfail
test that failed just because of this bug (this was the test that exposed
this bug). Both tests now succeed.

Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20190709160858.6316-1-nyh@scylladb.com>
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Scylla

Quick-start

To get the build going quickly, Scylla offers a frozen toolchain which would build and run Scylla using a pre-configured Docker image. Using the frozen toolchain will also isolate all of the installed dependencies in a Docker container. Assuming you have met the toolchain prerequisites, which is running Docker in user mode, building and running is as easy as:

$ ./tools/toolchain/dbuild ./configure.py
$ ./tools/toolchain/dbuild ninja build/release/scylla
$ ./tools/toolchain/dbuild ./build/release/scylla --developer-mode 1

Please see HACKING.md for detailed information on building and developing Scylla.

Note: GCC >= 8.1.1 is required 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>

Contributing to Scylla

Hacking howto Guidelines for contributing

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