repcached 2.2.1-1.2.8

repached script is patch set which adds data replication feature to memcached 1.2.x.

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LICENSE TYPE:
BSD License 
USER RATING:
2.6/5 17
DEVELOPED BY:
KLab Inc.
HOMEPAGE:
repcached.lab.klab.org
CATEGORY:
ROOT \ System \ System Administration
repached script is patch set which adds data replication feature to memcached 1.2.x.

Here are some key features of "repcached":

■ asynchronous data replication.
■ single master, single slave.
■ support all memcached command (set, add, delete, incr/decr, flush_all)
■ slave become master if master going down.
■ whole data copy to slave automatically when new slave connect to master.

Build

$ MCDVER=1.2.2
$ RCDVER=1.0

$ wget http://downloads.sourceforge.net/repcached/memcached-${MCDVER}-repcached-${RCDVER}.tar.gz
$ tar zxf memcached-${MCDVER}-repcached-${RCDVER}.tar.gz
$ cd memcached-${MCDVER}-repcached-${RCDVER}
--- OR ---
$ wget http://www.danga.com/memcached/dist/memcached-${MCDVER}.tar.gz
$ tar zxf memcached-${MCDVER}.tar.gz
$ cd memcached-${MCDVER}
$ wget http://downloads.sourceforge.net/repcached/repcached-${RCDVER}-${MCDVER}.patch.gz
$ gzip -cd repcached-${RCDVER}-${MCDVER}.patch.gz | patch -p1

$ ./configure --enable-replication
[notice: cannot set both --enable-replication and --enable-thread together]
$ make

make install

Run

repcached adds two new options (-x and -X).

$ memcached -h
(snip)
-x < ip_addr > hostname or IP address of the master replication server
-X < num > TCP port number of the master (default: 11212)

There are two machines called "foo" and "bar".

foo$ ./memcached (start as master)
bar$ ./memcached -x foo (start as slave and connect to master(foo))

Client set key/val to master(foo). We can get same value from slave(bar).

Failover

If master(foo) is down, slave(bar) become the new master automatically.

Failback

start memcached at foo as slave.

foo$ ./memcached -x bar (start as slave and connect to master(bar))

All data which master(bar) has will copy to new slave(foo), then master and slave have same data.

What's New in This Release:

■ release of repcached-2.1 for memcached-1.2.6

Last updated on December 13th, 2011

#data replication #memcached patch #asynchronous data replication #data #replication #memcached #patch

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