[question]removed failed server can be recovered automatically?

[lichunqiang]

; Allow failed memcached server to automatically be removed.
; Default is Off. (In previous versions, this setting was called memcached.sess_remove_failed)
;memcached.sess_remove_failed_servers = Off

; Set this value to enable the server be removed after
; configured number of continuous times connection failure.
;memcached.sess_server_failure_limit = 0

For this configuration, If one server is removed, it can be recovered automatically when the server is alive again.

[sodabrew]

It's a reasonable question, I'm not sure of the answer. The underlying behavior in libmemcached may be better documented in their API docs. http://docs.libmemcached.org/memcached_behavior.html?highlight=remove#MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS

[lichunqiang]

If enabled any hosts which have been flagged as disabled will be removed from the list of servers in the memcached_st structure.

It's init session save handlers after call session_start, Right?

So, The behavior (remove the failure server) belong to a request, not the whole php-fpm life circle.

Do I have an exact understanding? Wating your opinion.

Thanks.

[sodabrew]

The memcached connections for the session handler can be persistent or not persistent. If the session is persistent, the lifecycle is the php-fpm process. If the session is not persistent, the lifecycle is each request. The choice is made in the memcached.sess_persistent = On / Off INI value.

[lichunqiang]

Got it, Thanks for your reply @sodabrew .