yrmcds is a memory object caching system with master/slave replication. Since its protocol is perfectly compatible with that of memcached, yrmcds can be used as a drop-in replacement for memcached.
The biggest benefit of yrmcds is its amazingly low cost replication system. The master server is elected dynamically from a group of servers, which eliminates static master/slave configurations. By adopting virtual-IP based replication, no modifications to applications are required.
Unlike repcached, yrmcds is not a patch for memcached. No code is shared between yrmcds and memcached. yrmcds is developed for cybozu.com, a B2B cloud service widely adopted by companies in Japan.
- Memcached text and binary protocols.
- Server-side locking.
- Large objects can be stored in temporary files, not in memory.
- Virtual-IP based master-slave replication.
- Automatic fail-over.
- Automatic recovery of redundancy.
See also usage guide, future plans, differences from memcached, design notes and some benchmark results.
- Fairly recent Linux kernel.
- C++11 compiler (gcc 4.8.1+ or clang 3.3+).
- TCMalloc from Google.
- GNU make.
The following may help Ubuntu users to compile gcc 4.8.1:
sudo apt-get install libgmp-dev libmpfr-dev libmpc-dev build-essential
tar xjf gcc-4.8.1.tar.bz2
mkdir gcc-4.8.1/build
cd gcc-4.8.1/build
../configure --prefix=/usr/local/gcc --disable-shared --disable-multilib \
--enable-threads --enable-__cxa_atexit --enable-languages=c,c++ \
--disable-nls
make -j 4 BOOT_CFLAGS=-O2 bootstrap
sudo make install
make clean
export PATH=/usr/local/gcc/bin:$PATH- Prepare TCMalloc.
On Ubuntu, runapt-get install libgoogle-perftools-dev. - Run
make.
You can build yrmcds without TCMalloc by editing Makefile.
On Ubuntu, sudo make install installs yrmcds under /usr/local.
An upstart script and a logrotate configuration file are installed too.