Question: I'm not sure I understand from this slide what the difference between Varnish-Cache and memcached is. It seems like Varnish-Cache caches whole server responses (i.e. as we did in our proxy server in 213) whereas memcached is only for objects returned from database queries. Does this seem right? If so, does this mean that a server that processes mostly writes would be better serviced by memcached since the whole page in Varnish would be invalidated whereas memcached would still contain individual entries for the different parts of the page that was written to? For example, in a comment based page such as this one, adding a new comment would invalidate the whole page in Varnish, but memcached would still contain entries for each of the older comments, only needing to add the new one to the key-value store.
Question: I'm not sure I understand from this slide what the difference between Varnish-Cache and memcached is. It seems like Varnish-Cache caches whole server responses (i.e. as we did in our proxy server in 213) whereas memcached is only for objects returned from database queries. Does this seem right? If so, does this mean that a server that processes mostly writes would be better serviced by memcached since the whole page in Varnish would be invalidated whereas memcached would still contain individual entries for the different parts of the page that was written to? For example, in a comment based page such as this one, adding a new comment would invalidate the whole page in Varnish, but memcached would still contain entries for each of the older comments, only needing to add the new one to the key-value store.
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