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Merged pull request https://github.com/scylladb/scylla/pull/5393/ by Amos Kong: ` When I test the redis cmd by echo and nc, there is a redundant error in the end. I checked by strace, currently if client read nothing from stdin, it will shutdown the socket, redis server will read nothing (0 byte) from socket. But it tries to process the empty command and returns an error. $ echo -n -e '*1\r\n$4\r\nping\r\n' |strace nc localhost 6379 | ... | read(0, "*1\r\n$4\r\nping\r\n", 8192) = 14 | select(5, [4], [4], [], NULL) = 1 (out [4]) |>>> sendto(4, "*1\r\n$4\r\nping\r\n", 14, 0, NULL, 0) = 14 | select(5, [0 4], [], [], NULL) = 1 (in [0]) | recvfrom(0, 0x7ffe4d5b6c70, 8192, 0, 0x7ffe4d5b6bf0, 0x7ffe4d5b6bec) = -1 ENOTSOCK (Socket operation on non-socket) | read(0, "", 8192) = 0 |>>> shutdown(4, SHUT_WR) = 0 | select(5, [4], [], [], NULL) = 1 (in [4]) | recvfrom(4, "+PONG\r\n-ERR unknown command ''\r\n", 8192, 0, 0x7ffe4d5b6bf0, [0]) = 32 | write(1, "+PONG\r\n-ERR unknown command ''\r\n", 32+PONG | -ERR unknown command '' | ) = 32 | select(5, [4], [], [], NULL) = 1 (in [4]) | recvfrom(4, "", 8192, 0, 0x7ffe4d5b6bf0, [0]) = 0 | close(1) = 0 | close(4) = 0 Current result: $ echo -n -e '' |nc localhost 6379 -ERR unknown command '' $ echo -n -e '*1\r\n$4\r\nping\r\n' |nc localhost 6379 +PONG -ERR unknown command '' Expected: $ echo -n -e '' |nc localhost 6379 $ echo -n -e '*1\r\n$4\r\nping\r\n' |nc localhost 6379 +PONG
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 work directory
./build/release/scylla --workdir 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.
Documentation
Documentation can be found in ./docs and on the wiki. There is currently no clear definition of what goes where, so when looking for something be sure to check both. Seastar documentation can be found here. User documentation can be found here.
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>