Regarding Consistent Hashing....
rj at last.fm
Thu Aug 30 10:44:19 UTC 2007
On Thursday 30 August 2007 06:22:53 Ajinkya Nahar wrote:
> Hi all,
> I want to know whether consistent hashing technique can be used in
> production environment.
At last.fm we are using libketama in production, which does consistent hashing
for us. I would recommend starting off with consistent hashing, as it will
save you major headaches when you add and remove servers.
Ketama is not built in to the php memcache client tho, which is a shame. I
haven't yet found the time to test the branch in cvs for pecl memcache, which
does more or less the same thing (but using crc32 as the hash). At the mo we
use php_ketama in php to map keys to servers, which works but we don't get
the benefits of pipelining and the new stuff in the pecl client.
I've tested fnv instead of md5 in libketama, which is significantly faster
with a slightly better distribution. Next up is crc32 to see how that fairs..
contains the C lib, and a php, java and python implementation
> Is it still too young or is it of production quality?
> Also, what configuration needs to be done in the PHP client when using
> consistent hashing?
> Please let me know.
> Thanks in advance.
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