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This patch affects the LWT queries with IF conditions of the
following form: `IF col in :value`, i.e. if the parameter
marker is used.
When executing a prepared query with a bound value
of `(None,)` (tuple with null, example for Python driver), it is
serialized not as NULL but as "empty" value (serialization
format differs in each case).
Therefore, Scylla deserializes the parameters in the request as
empty `data_value` instances, which are, in turn, translated
to non-empty `bytes_opt` with empty byte-string value later.
Account for this case too in the CAS condition evaluation code.
Example of a problem this patch aims to fix:
Suppose we have a table `tbl` with a boolean field `test` and
INSERT a row with NULL value for the `test` column.
Then the following update query fails to apply due to the
error in IF condition evaluation code (assume `v=(null)`):
`UPDATE tbl SET test=false WHERE key=0 IF test IN :v`
returns false in `[applied]` column, but is expected to succeed.
Tests: unit(debug, dev), dtest(prepared stmt LWT tests at https://github.com/scylladb/scylla-dtest/pull/1286)
Fixes: #5710
Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com>
Message-Id: <20200205102039.35851-1-pa.solodovnikov@scylladb.com>
(cherry picked from commit bcc4647552)
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.
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>