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PODedicated memcache items vanishing
 

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    <p>I built an application in PHP on Google App Engine and in order to improve performance began using memcache to cache templates. It works really well as expected however I began seeing that items were disappearing from the shared cache after a few hours.</p> <p>The documentation states that the shared memcache is provided on a best effort basis and items will be expired if memory becomes an issue. To be clear, we are storing about 20 key/value pairs that are each about 10k.</p> <p>So assuming that these items were being expired because it was in a shared memcache, I upgraded to a 1 Gig dedicated memcache for our application.</p> <p>My code is pretty simple and straight forward:</p> <pre><code>$memcached = new Memcached(); $memcached-&gt;set('mykey', 'mydata', 1296000); </code></pre> <p>The above code should be setting that key and data with an expiration of 15 days. GAE docs indicate that the maximum is 30 days.</p> <p>When I run the code it works great and sets the key/data as expected. However when I go to bed and wake up in the morning, what does the memcache viewer in the application admin say?</p> <blockquote> <p>Oldest item age: 1 hour(s) 46 min(s) 25 second(s)</p> </blockquote> <p>What the heck? There is no code that is flushing or deleting, it's a dedicated memcache.</p> <p>What am I doing wrong? It really seems like something is causing the memcache to expire prematurely. This is a very very low volume application so from the time I set this to the time I checked it (according to the logs) there was only 1 visit (approximately 1 hour and 46 minutes ago).</p> <p>When an instance shuts down if it's the last resident instance does it clear the memcache?</p> <p>Thanks for any help you can provide.</p>
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    1. USArlo Gilbert
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    1. COSeems weird. Try setting it to `0` to see if the items are cached forever. The 30 days by the way should only be a max when using seconds. With a timestmap it's possible to set a larger expire time
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