Avi Kivity 0754e9a34d Merge "Even more commitlog fixes" from Calle
"Fixes for commitlog (debug) test failures related to shutdowns.
Note that most the fixes here are only really related to the tests
failing, not really real scylla runs. However, at some point we'll
have real shutdown in scylla as well (not just hard exit), at which
point this becomes more relevant there as well.

Main issue was post-flush continuation chains for stats update
remaining unexecuted, due to task reordering, once the commitlog
object itself had been destroyed. This could have been handled by just
making the stats object a shared pointer, but in general it seems more
prudent to enforce having all tasks completed after shutdown.

* Change commitlog shutdown to use gate+wait for all outstanding ops
  (flush, write, timer). Thus we can ensure everything is finished
  when returning from "shutdown".
* Fix bug with "commitlog::clear" (test method) not doing the intended deed
* Most importantly, fix the tests themselves, cleaning up old crud, and
  fixing invalid assumptions (CL behaviour changed quite a bit since tests
  were created), and remove races.

Disclaimer: I've _never_ managed to reproduce the debug tests failing
like in jenkins locally (though I managed to provoke other failures),
but at least jenkins runs with this series have been clean. Knock knock."
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#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>
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