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e5dca96af3
"snapshotting the files themselves is easy: if more than one CF happens to link an SSTable twice, all but one will fail, and we will end up with one copy. The problem for us, is that the snapshot procedure is supposed to leave a manifest file inside its directory. So if we just call snapshot() from multiple shards, only the last one will succeed, writing its own SSTables to the manifest leaving all other shards' SSTables unaccounted for. Moreover, for things like drop table, the operation should only proceed when the snapshot is complete. That includes the manifest file being correctly written, and for this reason we need to wait for all shards to finish their snapshotting before we can move on."
#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 -i -t <image name>