connection error + other issues with Redis

Replies: 0

I have been experiencing issues with Redis and the issues persist or come up randomly until I flush the Redis fully then the issues go away for a couple of hours and then they come back probably as Redis start caching stuff. For example with Redis active, users cannot put a comment for woocommerce products as it just goes to ‘Error establishing a Redis connection - To disable Redis, delete the object-cache.php file in the /wp-content/ directory.‘

Or, the checkout page does not work giving this kind of error ‘There was an error processing your order. Please check for any charges in your payment method and review your order history before placing the order again.‘ until I clear Redis cache…

Or, sometimes when trying to install a plugin Redis crashes the website, or when trying to update a plugin, or create a page, and many more…

Timeouts are all set to high, the maxclient number, and many other settings in the past few days all modified to mitigate the issue but no luck. The memory is not an issue as I have set 16 gb of RAM for Redis and it uses around 5 gb ram now.

Any feedback on this?

Diagnostics:

Status: Connected
Client: PhpRedis (v6.1.0)
Drop-in: Valid
Disabled: No
Ping: 1
Errors: []
PhpRedis: 6.1.0
Relay: Not loaded
Predis: 2.1.2
Credis: Not loaded
PHP Version: 8.4.4
Plugin Version: 2.5.4
Redis Version: 6.2.17
Multisite: No
Metrics: Enabled
Metrics recorded: 2345
Filesystem: File modifications are not allowed.
Global Prefix: "xxx_"
Blog Prefix: "xxx_"
Timeout: 300
Read Timeout: 300
Retry Interval:
WP_REDIS_CLIENT: "phpredis"
WP_REDIS_SCHEME: "tcp"
WP_REDIS_HOST: "127.0.0.1"
WP_REDIS_PORT: 6379
WP_REDIS_DATABASE: 0
WP_REDIS_TIMEOUT: 300
WP_REDIS_READ_TIMEOUT: 300
WP_REDIS_PREFIX: "uiv_redis_cache"
WP_REDIS_PLUGIN_PATH: "/var/xxx/xxx.xxx/xxx/wp-content/plugins/redis-cache"
Global Groups: [
"blog-details",
"blog-id-cache",
"blog-lookup",
"global-posts",
"networks",
"rss",
"sites",
"site-details",
"site-lookup",
"site-options",
"site-transient",
"users",
"useremail",
"userlogins",
"usermeta",
"user_meta",
"userslugs",
"redis-cache",
"blog_meta",
"image_editor",
"network-queries",
"site-queries",
"theme_files",
"translation_files",
"user-queries"
]
Ignored Groups: [
"counts",
"plugins",
"theme_json",
"themes"
]
Unflushable Groups: []
Groups Types: {
"blog-details": "global",
"blog-id-cache": "global",
"blog-lookup": "global",
"global-posts": "global",
"networks": "global",
"rss": "global",
"sites": "global",
"site-details": "global",
"site-lookup": "global",
"site-options": "global",
"site-transient": "global",
"users": "global",
"useremail": "global",
"userlogins": "global",
"usermeta": "global",
"user_meta": "global",
"userslugs": "global",
"redis-cache": "global",
"blog_meta": "global",
"image_editor": "global",
"network-queries": "global",
"site-queries": "global",
"theme_files": "global",
"translation_files": "global",
"user-queries": "global",
"counts": "ignored",
"plugins": "ignored",
"theme_json": "ignored",
"themes": "ignored"
}
Drop-ins: [
"maintenance.php v by ",
"Redis Object Cache Drop-In v2.5.4 by Till Krüss"
]

redis-cli info memory

used_memory:5380604960
used_memory_human:5.01G
used_memory_rss:5477302272
used_memory_rss_human:5.10G
used_memory_peak:5434960648
used_memory_peak_human:5.06G
used_memory_peak_perc:99.00%
used_memory_overhead:275857376
used_memory_startup:812184
used_memory_dataset:5104747584
used_memory_dataset_perc:94.89%
allocator_allocated:5380619440
allocator_active:5401038848
allocator_resident:5472956416
total_system_memory:33383559168
total_system_memory_human:31.09G
used_memory_lua:56320
used_memory_lua_human:55.00K
used_memory_scripts:1456
used_memory_scripts_human:1.42K
number_of_cached_scripts:2
maxmemory:17179869184
maxmemory_human:16.00G
maxmemory_policy:volatile-lru
allocator_frag_ratio:1.00
allocator_frag_bytes:20419408
allocator_rss_ratio:1.01
allocator_rss_bytes:71917568
rss_overhead_ratio:1.00
rss_overhead_bytes:4345856
mem_fragmentation_ratio:1.02
mem_fragmentation_bytes:96922392
mem_not_counted_for_evict:0
mem_replication_backlog:0
mem_clients_slaves:0
mem_clients_normal:20616
mem_aof_buffer:0
mem_allocator:jemalloc-5.1.0
active_defrag_running:0
lazyfree_pending_objects:0
lazyfreed_objects:0

redis-cli DBSIZE

(integer) 5040319