29ce425862b86d56bbc1f802b2b021a1aa75bd10
Similar to a mutation_reader, but limited: it only returns whether a key is sure not to exist in some mutation source. Non-blocking and expected to execute fast. Corresponds to an sstable bloom filter. To avoid ambiguity, it doesn't return a bool, instead a longer but less ambiguous "definitely_doesnt_exists" or "maybe_exists".
#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
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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