I’m using the Memcached extension in PHP, and I observe a strange behavior.
false with a result of
RES_NOTFOUND, even though the key has been set with
Memcached::set. This happens a few times an hour on a server with about 300 Memcached requests per second.
First I thought, somehow the set requests may fail and delete the key instead of updating it. Now I made a statistic about the different results, and I only receive RES_SUCCESS or RES_NOTFOUND. This makes me think that any error that happens while getting a key reports as not found, even though there are many result codes documented.
Is there a way to get more precise result codes? Or is it just impossible to rely on finding an existing key?
By the way, we are using PHP 7.2.