eb09eddee57a3fddd2204d0b0984452977c8fdfb
"Histograms are used to collect latency information, in Origin, many of the operations are timed, this is a potential performance issue. This series adds an option to sample the operations, where small amount will be timed and the most will only be counted. This will give an estimation for the statistics, while keeping an accurate count of the total events and have neglectible performance impact. The first to use the modified histogram are the column family for their read and write." Conflicts: database.hh
#Urchin
##Building Urchin
In addition to required packages by Seastar, the following packages are required by Urchin.
Submodules
Urchin uses submodules, so make sure you pull the submodules first by doing:
git submodule init
git submodule update
Building urchin on Fedora
Installing required packages:
sudo yum install yaml-cpp-devel lz4-devel zlib-devel snappy-devel jsoncpp-devel thrift-devel antlr3-tool libasan libubsan
Building urchin on Ubuntu 14.04
Installing required packages:
sudo apt-get install libyaml-cpp-dev liblz4-dev zlib1g-dev libsnappy-dev libjsoncpp-dev
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