[Session/Cookie] session配置为memcached或redis后的错误提示？

Question

配置文件：

$config['sess_driver'] = 'memcached';
$config['sess_cookie_name'] = 'caiwu';
$config['sess_expiration'] = 604800;
$config['sess_save_path'] = 'localhost:11211';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;

配置后运行日志有大量如下错误：
ERROR - 2018-02-22 12:05:26 --> Session: Unable to obtain lock for ci_session:gb2ikrdgi9lravrtoad49ehv12k6e912 after 30 attempts, aborting.
ERROR - 2018-02-22 12:05:27 --> Severity: Warning --> Unknown: Failed to write session data (user). Please verify that the current setting of session.save_path is correct (localhost:11211) Unknown 0

Answer 1

Severity: Warning --> Unknown: Failed to write session data (user). Please verify that the current setting of session.save_path is correct (localhost:11211) Unknown 0 写sessino数据失败，请检查session.save_path 配置，正确，

Answer 2

Session save path是写你存储的路径(目录的位置)，不是网络的url.比如:/tmp/sessions/