The error 'memcached flush_all not working' might be caused by various reasons, such as networking or firewall issues, incorrect configuration settings, memory allocation problems, or version incompatibilities. It can also happen due to the presence of large data sets that may take a significant amount of time to flush out entirely from the cache. Additionally, some Memcached clients do not support the flush_all command or have restrictions on its usage, which could result in the error.
To resolve the 'memcached flush_all not working' error, you can start by verifying if the Memcached server is running and accessible through the network. Check for any firewall rules or network issues that may be preventing the flush_all command from being executed. Also, ensure that the Memcached configuration file has the correct settings, including the maximum memory limit.
If the issue persists, try increasing the timeout value for the flush_all command or executing it multiple times to flush out larger data sets. If your client does not support the flush_all command, try using an alternative method like deleting keys individually or using a different client library that supports the command.
Lastly, consider upgrading to the latest version of Memcached or checking for compatibility issues between the client and server versions. By following these steps, you should be able to resolve the 'memcached flush_all not working' error and ensure smooth operation of your caching system.