Memcached HA -how to replicate data from one memcached to another?

[chmin wu]

     Hi, I have two memcached server running in different machine for HA purpose- they are used to backup for each other. The data stored in memcached is very important for my application; memcached servers must have the same data for backup.

    So the question is,  if a memcached server crashes and resume, how to completely replicate all the data from the  the healthy one to the rusumed one?

    Many thanks in advance!

[Yiftach Shoolman]

Hi,

In general, Memcached was not built for HA. 

IMO this is #1 drawback of Memcached, as these days many people are storing information on Memcached without backing it with persistence RDBMS/NoSQL solution; in-order to maintain the high-throughput low-latency of their application.

That being said, there some open source and commercial solutions that solve this issue, e.g. Redis, Membase (now Couchbase), and Garantia.

Best,

Yiftach

(Disclosure: I'm one of the Founders of Garantia) 

--
Yiftach Shoolman
+972-54-7634621

[Bluejack]

Membase/couchbase is nice because it is interface-compatible with memcache. However, you will not get the same performance from it as from memcache, and it is not as stable under very high load.

-bluejack

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Work as though you live in the younger days of a better nation.

~~ Dennis Lee

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[comain chen]

That might be done in the client. You can turn on replicating and
fail-over, during fail-over you need
read-repair to restore data on the resumed instance. However to make
these work correctly, careful programming is needed.

Best regrads,
Chen,Congwu