forked from extern/egroupware
Switching consistent hashing (Libketama) off by default
as for just 2 Memcached servers it creates an extrem unbalanced distribution favoring the 2. server and has no benefits, as requests to the failed node can only go to the other one anyway.
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@ -42,6 +42,17 @@ class Memcached extends Base implements ProviderMultiple
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*/
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private $timeout = 20;
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/**
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* Use Libketama consistent hashing
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*
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* Off by default as for just 2 Memcached servers it creates an extrem
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* unbalanced distribution favoring the 2. server and has no benefits
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* as requests to the failed node can only go to the other one anyway.
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*
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* @var boolean
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*/
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private $consistent = false;
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/**
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* Retry on node failure: 0: no retry, 1: retry on set/add/delete, 2: allways retry
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*
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@ -55,7 +66,7 @@ class Memcached extends Base implements ProviderMultiple
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* @throws Exception if connection to backend could not be established
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* @param array $params eg. array('localhost'[,'localhost:11211',...])
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* "timeout" in ms, "retry" on node failure 0: no retry (default), 1: retry on set/add/delete, 2: allways retry
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* "prefix" prefix for keys
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* "prefix" prefix for keys and "consistent=1" to enable (by default disabled) consistent caching
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*/
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function __construct(array $params=null)
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{
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@ -76,6 +87,10 @@ class Memcached extends Base implements ProviderMultiple
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$prefix = $params['prefix'];
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unset($params['prefix']);
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}
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if (isset($params['consistent']))
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{
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$this->consistent = !empty($params['consistent']);
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}
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check_load_extension('memcached',true);
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// using a persitent connection for identical $params
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@ -86,10 +101,10 @@ class Memcached extends Base implements ProviderMultiple
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\Memcached::OPT_CONNECT_TIMEOUT => $this->timeout,
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\Memcached::OPT_SEND_TIMEOUT => $this->timeout,
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\Memcached::OPT_RECV_TIMEOUT => $this->timeout,
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// use more effician binary protocol (also required for consistent hashing
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// use more efficient binary protocol (also required for consistent hashing)
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\Memcached::OPT_BINARY_PROTOCOL => true,
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// enable Libketama compatible consistent hashing
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\Memcached::OPT_LIBKETAMA_COMPATIBLE => true,
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// Libketama compatible consistent hashing
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\Memcached::OPT_LIBKETAMA_COMPATIBLE => $this->consistent,
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// automatic failover and disabling of failed nodes
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\Memcached::OPT_SERVER_FAILURE_LIMIT => 2,
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// setting a prefix for all keys
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