redis.pconnect.connection_limit is being ignored.

[cdeguzman]

Hi,

Why does redis.pconnect.connection_limit setting, looks like its being ignored by phpredis. I have set this setting to 30, redis.pconnect.pooling_enabled=1 and redis.clusters.persistent=1, and saw the current connections to redis well over its set limit. The limit was set to 30 but the current connections in redis was way beyond that like 300+

I am using RedisCluster class to connect:

$redis = new \RedisCluster(null, $seeds, $timeout, $readTimeout, true)

Am I missing something to make it work or how does it actually limit the connections?

Below is the is environment I am running:

Server php version (AWS EC2):

PHP Version => 7.0.32
Thread Safety => disabled

*php-fpm pool set to 30

Redis (AWS Elasticache):

Engine version: 6.2.6
Cluster mode: On

Phpredis settings:

redis

Redis Support => enabled
Redis Version => 4.3.0
Available serializers => php, igbinary
Available compression => lzf

Directive => Local Value => Master Value
redis.arrays.algorithm => no value => no value
redis.arrays.auth => no value => no value
redis.arrays.autorehash => 0 => 0
redis.arrays.connecttimeout => 0 => 0
redis.arrays.consistent => 0 => 0
redis.arrays.distributor => no value => no value
redis.arrays.functions => no value => no value
redis.arrays.hosts => no value => no value
redis.arrays.index => 0 => 0
redis.arrays.lazyconnect => 0 => 0
redis.arrays.names => no value => no value
redis.arrays.pconnect => 0 => 0
redis.arrays.previous => no value => no value
redis.arrays.readtimeout => 0 => 0
redis.arrays.retryinterval => 0 => 0
redis.clusters.auth => no value => no value
redis.clusters.persistent => 1 => 1
redis.clusters.read_timeout => 0 => 0
redis.clusters.seeds => no value => no value
redis.clusters.timeout => 0 => 0
redis.pconnect.connection_limit => 30 => 30
redis.pconnect.pooling_enabled => 1 => 1
redis.session.lock_expire => 0 => 0
redis.session.lock_retries => 10 => 10
redis.session.lock_wait_time => 2000 => 2000
redis.session.locking_enabled => 0 => 0

[yatsukhnenko]

Hi @cdeguzman,
redis.pconnect.connection_limit is a per-worker limit of connections to the same server, so you may see up to 30 * N connections since you have configured 30 workers and N is the number of nodes in cluster.