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How is memcached redundant?

April 26, 2017memcached redundant

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10 Posted

How is memcached redundant?

2 Answers

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Posted

It’s not! Surprise! Memcached is a caching layer for your application. It is not designed to have any data redundancy. If a node loses all of its data, you should still be able to fetch it all again from the source. Especially be careful that your application can survive losing memcached instances. Don’t write awful queries and expect memcached to be a fix-all! If you’re worried about having too much of a spike in database usage during failure, you have some options. You can add more nodes (lessen impact of losing one), hotspares (take over IP address when down), etc.

0

Posted

It’s not! Surprise! Memcached is a *caching layer* for your application. It is not designed to have any data redundancy. If a node loses all of its data, you should still be able to fetch it all again from the source. Especially be careful that your application *can* survive losing memcached instances. Don’t write awful queries and expect memcached to be a fix-all! If you’re worried about having too much of a spike in database usage during failure, you have some options. You can add more nodes (lessen impact of losing one), hotspares (take over IP address when down), etc.