Glauber Costa c9f2d1d105 do not crash in user-defined operations if the controller is disabled
Scylla currently crashes if we run manual operations like nodetool
compact with the controller disabled. While we neither like nor
recommend running with the controller disabled, due to some corner cases
in the controller algorithm we are not yet at the point in which we can
deprecate this and are sometimes forced to disable it.

The reason for the crash is that manual operations will invoke
_backlog_of_shares, which returns what is the backlog needed to
create a certain number of shares. That scan the existing control
points, but when we run without the controller there are no control
points and we crash.

Backlog doesn't matter if the controller is disabled, and the return
value of this function will be immaterial in this case. So to avoid the
crash, we return something right away if the controller is disabled.

Fixes #5016

Signed-off-by: Glauber Costa <glauber@scylladb.com>
2019-09-16 18:26:57 +02:00
2019-08-05 14:55:53 +02:00
2019-09-16 11:52:55 +03:00
2019-09-03 07:43:35 -07:00
2019-08-05 14:55:53 +02:00
2019-08-05 14:55:53 +02:00
2019-02-20 08:03:46 -08:00
2019-07-29 17:15:51 +02:00
2019-03-28 14:21:10 +02:00
2019-05-07 09:55:53 +03:00
2019-09-11 18:01:58 +03:00
2019-08-14 10:02:00 -07:00
2019-09-07 10:07:33 -07:00
2019-06-17 13:09:54 +01:00
2019-08-05 14:55:53 +02:00

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

Scylla APIs and compatibility

By default, Scylla is compatible with Apache Cassandra and its APIs - CQL and Thrift. There is also experimental support for the API of Amazon DynamoDB, but being experimental it needs to be explicitly enabled to be used. For more information on how to enable the experimental DynamoDB compatibility in Scylla, and the current limitations of this feature, see Alternator and Getting started with Alternator.

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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