http://docs.libmemcached.org/memcached_behavior_set.html#memcached_behavior_number_of_replicas <http://docs.libmemcached.org/memcached_behavior_set.html#memcached_behavior_number_of_replicas> or <http://docs.libmemcached.org/memcached_behavior_set.html#memcached_behavior_number_of_replicas> http://search.cpan.org/~timb/Memcached-libmemcached-0.4406/lib/Memcached/libmemcached/memcached_behavior.pm#MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS
Is that feature working in libmemcached? I tried with Perl's Memcached::libmemcached two different versions: - Version 0.3102 (with libmemcached-0.31 embedded) - Version 0.4406 (with libmemcached-0.44 embedded) <http://docs.libmemcached.org/memcached_behavior_set.html#memcached_behavior_number_of_replicas> and watching with Wireshark (and also reading from individual servers) I only saw a writes to a single server. use Memcached::libmemcached qw(:memcached_behavior_t ); use strict; use warnings; my $memc = Memcached::libmemcached->new; $memc->memcached_server_add( 'localhost', 11211 ); $memc->memcached_server_add( 'localhost', 11212 ); # Also tried specifying 2 for number of replicas $memc->memcached_behavior_set( MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS() => 1 ); $memc->memcached_set( 'test', 1, 10 ) || die 'set failed ' . $memc->errstr; Also, what does MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT do? Does that mean after a server reports that many failures any gets or sets to that server will fail without the library attempting to send to the memcached server? I assume that doesn't mean the server will be pulled out of the pool and keys would get rehashed to new servers. (Although, maybe if MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS is set, but if that means keys would hash to different servers that seems like a bad idea.) Yes, I'm looking at poor-man's HA with these two features. Looking at how pulling the plug on one server won't result in get or set failures, and not an increased amount of time (say waiting for a failed server to respond). -- Bill Moseley mose...@hank.org
