Title: Flush doesn’t work within wp-admin (timeout?) Last modified: November 10, 2019 --- # Flush doesn’t work within wp-admin (timeout?) * Resolved [Hubert Nguyen](https://wordpress.org/support/users/hubertnguyen/) * (@hubertnguyen) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/) * Hello, this plugin used to have (timeout?) issues with Redis cache flush on my website, but usually, after a couple of tries, it would work. * From the latest update (v5.0.2), the plugin quickly answers “Object cache could not be flushed.” with little more information. * I thought it was a timeout due to the cache size (~1GB, not big), but even after flushing the cache manually and reducing it to ~100MB, I’m still having this issue. Is there a log file that I could look at to see what the problem is? * I currently have to flush the cache from the Redis command-line each time. Other than that, everything else seems to work. Thanks! Viewing 12 replies - 1 through 12 (of 12 total) * Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12116441) * Can you post your diagnostics? * [George](https://wordpress.org/support/users/subscriptiongroup/) * (@subscriptiongroup) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12119036) * Not sure if it’s related but i started receiving the same error when i enabled define(‘WP_CACHE_KEY_SALT’, ‘www.site.com’); define(‘WP_REDIS_SELECTIVE_FLUSH’, true); Flushing works fine without these * Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12119145) * If you don’t need selective flushing, I highly recommend not using it. * Thread Starter [Hubert Nguyen](https://wordpress.org/support/users/hubertnguyen/) * (@hubertnguyen) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12119152) * Till, which diagnostics? * Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12123163) * You’ll find them under Settings – Redis and then at the bottom of the server list. * Thread Starter [Hubert Nguyen](https://wordpress.org/support/users/hubertnguyen/) * (@hubertnguyen) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12123478) * Got it! I’ve removed the IP and some site-specific info like the SALT * Status: Connected Client: PhpRedis (v5.0.2) Drop-in: Valid Ping: 1 Redis Extension: 5.0.2 Predis Client: 1.1.1 PHP Version: 7.2.21-1+0~20190807.25+debian10~1.gbp935ebf Multisite: No Global Prefix: “wp_” Blog Prefix: “wp_” WP_REDIS_HOST: “—-REMOVED—” WP_REDIS_PORT: —-REMOVED— WP_CACHE_KEY_SALT: “—-REMOVED—” WP_REDIS_PASSWORD: “*************************************” Global Groups: { “0”: “blog-details”, “1”: “blog-id-cache”, “2”: “blog-lookup”,“ 3”: “global-posts”, “4”: “networks”, “5”: “rss”, “6”: “sites”, “7”: “site-details”,“ 8”: “site-lookup”, “9”: “site-options”, “10”: “site-transient”, “11”: “users”,“ 12”: “useremail”, “13”: “userlogins”, “14”: “usermeta”, “15”: “user_meta”, “16”:“ userslugs”, “33”: “blog_meta” } Ignored Groups: [ “counts”, “plugins” ] Unflushable Groups: [] Dropins: – advanced-cache.php v by – Redis Object Cache Drop-In v1.5.0 by Till Krüss Plugins: – Akismet Anti-Spam v4.1.3 by Automattic (Active) – AMP v1.4.0 by AMP Project Contributors (Active) – CDN Enabler v1.0.9 by KeyCDN (Active)– Classic Editor v1.5 by WordPress Contributors (Active) – Custom Post Type UI v1.7.1 by WebDevStudios (Active) – Disable REST API v1.4.3 by Dave McHale (Active)– Fastly v1.2.9 by (Active) – Heartbeat Control by WP Rocket v2.0 by WP Rocket ( Active) – Hotfix v1.2 by Mark Jaquith (Inactive) – Jetpack by WordPress.com v7.9 by Automattic (Active) – MonsterInsights – Dimensions Addon v1.3.0 by MonsterInsights Team (Active) – MonsterInsights – EU Compliance v1.1.0 by MonsterInsights Team( Inactive) – MonsterInsights Pro v7.10.0 by MonsterInsights (Active) – Post Type Switcher v3.2.0 by John James Jacoby (Active) – Query Monitor v3.4.0 by John Blackbourn (Inactive) – Redis Object Cache v1.5.0 by Till Krüss (Active) – SEO Friendly Images v3.0.5 by Vladimir Prelovac (Active) – SEO Smart Links Professional v1.8.8 by Vladimir Prelovac (Active) – Term Management Tools v1.1.4 by scribu( Inactive) – User Role Editor v4.52 by Vladimir Garagulya (Inactive) – VaultPress v2.0.1 by Automattic (Active) – WP-Optimize – Clean, Compress, Cache v3.0.13 by David Anderson, Ruhani Rabin, Team Updraft (Inactive) – WP-PageNavi v2.93.1 by Lester ‘GaMerZ’ Chan (Inactive) – WP Minify v1.2.0 by Thaya Kareeson (Active)– WP Super Cache v1.7.0 by Automattic (Inactive) * Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12123513) * That’s strange. Can you run “wp cache flush” via WP CLI and see if that works? * How large is your Redis instance? * Thread Starter [Hubert Nguyen](https://wordpress.org/support/users/hubertnguyen/) * (@hubertnguyen) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12123567) * I don’t have WP-CLI access (managed LAMP) but my Redis is 1GB big. * Even from the redis console, a 1GB cache clear can be a little long (~10-15 sec?) but it is near instant for 100MB. * Did you change how you handle timeouts in the new version? * Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12124971) * Aha, this is really good to know. * Yes, the timeouts have changed. For now, I’d suggest setting `WP_REDIS_TIMEOUT` and `WP_REDIS_READ_TIMEOUT` to `0` for infinite. * [https://github.com/tillkruss/redis-cache#connection-parameters](https://github.com/tillkruss/redis-cache#connection-parameters) * Thread Starter [Hubert Nguyen](https://wordpress.org/support/users/hubertnguyen/) * (@hubertnguyen) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12124984) * I thought so. I’ll try the above, looks like it should work. Maybe there’s a way to make it async to avoid issues with load-balancers timing out etc. But for now, it should work. * I appreciate the fast replies Till. Cheers, * Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [6 years, 7 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12125347) * Good, I’m glad it’s working. * FLUSHDB is actually an atomic/blocking command, Redis won’t do anything until the flush is finished. * There is a FLUSHDB ASYNC command, which is supported and extensively tested by the [business edition](https://wprediscache.com). * [Millionleaves](https://wordpress.org/support/users/millionleaves/) * (@millionleaves) * [6 years, 6 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12205755) * I was having this issue on several sites out of many that are all configured in more-or-less the same way. Disabling WP_REDIS_SELECTIVE_FLUSH solved the problem, but I need that enabled. * However, I then tried changing the value of WP_CACHE_KEY_SALT for a couple of sites and the problem was fixed. Viewing 12 replies - 1 through 12 (of 12 total) The topic ‘Flush doesn’t work within wp-admin (timeout?)’ is closed to new replies. * ![](https://ps.w.org/redis-cache/assets/icon-256x256.gif?rev=2568513) * [Redis Object Cache](https://wordpress.org/plugins/redis-cache/) * [Support Threads](https://wordpress.org/support/plugin/redis-cache/) * [Active Topics](https://wordpress.org/support/plugin/redis-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/redis-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/redis-cache/reviews/) ## Tags * [redis](https://wordpress.org/support/topic-tag/redis/) * 12 replies * 3 participants * Last reply from: [Millionleaves](https://wordpress.org/support/users/millionleaves/) * Last activity: [6 years, 6 months ago](https://wordpress.org/support/topic/flush-doesnt-work-within-wp-admin-timeout/#post-12205755) * Status: resolved