Caching 发生了不需要的内存缓存刷新

我有一个memcached，问题是出现了异常刷新

这是

stats

结果，您可以看到

cmd\u flush

计数是1995。 这个问题降低了我的命中率

STAT pid 1
STAT uptime 2470241
STAT time 1603874035
STAT version 1.6.7
STAT libevent 2.1.8-stable
STAT pointer_size 64
STAT rusage_user 1081.993829
STAT rusage_system 1655.707943
STAT max_connections 1024
STAT curr_connections 21
STAT total_connections 4419
STAT rejected_connections 0
STAT connection_structures 29
STAT response_obj_oom 0
STAT response_obj_count 1
STAT response_obj_bytes 65536
STAT read_buf_count 17
STAT read_buf_bytes 278528
STAT read_buf_bytes_free 196608
STAT read_buf_oom 0
STAT reserved_fds 20
STAT cmd_get 3052005
STAT cmd_set 2976134
STAT cmd_flush 1995
STAT cmd_touch 0
STAT cmd_meta 0
STAT get_hits 1885918
STAT get_misses 1166087
STAT get_expired 0
STAT get_flushed 431
STAT delete_misses 0
STAT delete_hits 0
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 511644502693
STAT bytes_written 305452071950
STAT limit_maxbytes 1992294400
STAT accepting_conns 1
STAT listen_disabled_num 0
STAT time_in_listen_disabled_us 0
STAT threads 4
STAT conn_yields 0
STAT hash_power_level 16
STAT hash_bytes 524288
STAT hash_is_expanding 0
STAT slab_reassign_rescues 39057
STAT slab_reassign_chunk_rescues 0
STAT slab_reassign_evictions_nomem 0
STAT slab_reassign_inline_reclaim 3167
STAT slab_reassign_busy_items 353
STAT slab_reassign_busy_deletes 0
STAT slab_reassign_running 0
STAT slabs_moved 231393
STAT lru_crawler_running 0
STAT lru_crawler_starts 182325
STAT lru_maintainer_juggles 35395770
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 bytes 4902485
STAT curr_items 28
STAT total_items 3015188
STAT slab_global_page_pool 845
STAT expired_unfetched 1088617
STAT evicted_unfetched 0
STAT evicted_active 0
STAT evictions 0
STAT reclaimed 1090599
STAT crawler_reclaimed 0
STAT crawler_items_checked 568538
STAT lrutail_reflocked 41
STAT moves_to_cold 1689697
STAT moves_to_warm 6112
STAT moves_within_lru 188
STAT direct_reclaims 0
STAT lru_bumps_dropped 0

我怎样才能解决这个问题