Hi At work we're setting up a multi-layered cluster with a 1st line of web/proxy/cache servers (nginx+memcached) and several layers of PHP-FPM and Tomcat application servers. At the moment we're using memcached just to cache raw HTML pages, not serialized objects: upon a request nginx checks if that URL (key) is on memcached and then serves it, else it proxies the request to the appropriate app server which serves it and saves it to memcached. Pretty basic memcached usage.
The problem is that we can't get the PHP, Java and nginx implementations to work together, the PHP and Java consistent hashing algorithms don't seem to match. We're using: - nginx: http://wiki.nginx.org/NginxHttpUpstreamConsistentHash - PHP: PECL:memcache http://pecl.php.net/package/memcache - Java: spymemcached http://code.google.com/p/spymemcached/ Both the nginx and PHP implementations match, any HTML representation saved by PHP is retrieved by nginx from the same memcached server; but spymemcached's implementation seems to be different and with 2 memcached server only matches 50% of the time, so it's a completely different algorithm and the matches are random. We're using the nginx patch and PECL:memcached with their default configuration, and as for spymemcached we've tried the NATIVE_HASH, CRC32_HASH and KETAMA_HASH algorithms but none of them matches nginx' and PHP's hashing. Anybody else here is using memcached in Java and PHP and got them to work together? I've searched the list and this question has been raised several times but haven't find any definitive answer, just the obvious "different libraries may use different hashing implementations". We don't mind switching to other libraries. Thanks in advance. Regards -- Vicente Aguilar <bise...@bisente.com> | http://www.bisente.com
