与`delete_hits`相比，Memcache`delete_misses`非常高，而`evictions`为0

Question

我正在使用Memcached为我的项目缓存html。但是大多数缓存的页面都没有被提取，导致服务器超时。与delete_misses相比，delete_hits处于相当高的位置，而evictions为0。

以下是memcached统计数据：

STAT pid 18323
STAT正常运行时间384753
STAT时间1468390067
STAT版本1.4.27
STAT libevent 1.4.13-stable
STAT pointer_size 64
STAT rusage_user 75.178571
STAT rusage_system 31.052279
STAT curr_connections 10
STAT total_connections 9517
STAT connection_structures 25
STAT reserved_fds 20
STAT cmd_get 9410
STAT cmd_set 991
STAT cmd_flush 0
STAT cmd_touch 0
STAT get_hits 7788
STAT get_misses 1622
STAT get_expired 265
STAT delete_misses 18439
STAT delete_hits 117
STAT incr_misses 0
STAT incr_hits 0
STAT decr_misses 0
STAT decr_hits 0
STAT cas_misses 0
STAT cas_hits 0
STAT cas_badval 0
STAT touch_hits 0
STAT touch_misses 0
STAT auth_cmds 0
STAT auth_errors 0
STAT bytes_read 45007488
STAT bytes_written 321441436
STAT limit_maxbytes 1073741824
STAT accepting_conns 1
STAT listen_disabled_num 0
STAT time_in_listen_disabled_us 0
STAT线程4
STAT conn_yields 0
STAT hash_power_level 16
STAT hash_bytes 524288
STAT hash_is_expanding 0
STAT malloc_fails 0
STAT log_worker_dropped 0
STAT log_worker_written 0
STAT log_watcher_skipped 0
STAT log_watcher_sent 0
STAT字节12134672
STAT curr_items 266
STAT total_items 991
STAT expired_unfetched 188
STAT evicted_unfetched 0
STAT驱逐0
STAT收回340
STAT crawler_reclaimed 0
STAT crawler_items_checked 0
STAT lrutail_reflocked 0
END

Answer 1

假设密钥正确，可能因项目已过期而发生。