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We use boost::any to convert to and from database values (stored in serlialized form) and native C++ values. boost::any captures information about the data type (how to copy/move/delete etc.) and stores it inside the boost::any instance. We later retrieve the real value using boost::any_cast. However, data_value (which has a boost::any member) already has type information as a data_type instance. By teaching data_type intances about the corresponding native type, we can elimiante the use of boost::any. While boost::any is evil and eliminating it improves efficiency somewhat, the real goal is growing native type support in data_type. We will use that later to store native types in the cache, enabling O(log n) access to collections, O(1) access to tuples, and more efficient large blob support.
#Scylla
##Building Scylla
In addition to required packages by Seastar, the following packages are required by Scylla.
Submodules
Scylla uses submodules, so make sure you pull the submodules first by doing:
git submodule init
git submodule update --recursive
Building scylla on Fedora
Installing required packages:
sudo yum install yaml-cpp-devel lz4-devel zlib-devel snappy-devel jsoncpp-devel thrift-devel antlr3-tool antlr3-C++-devel libasan libubsan
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>