The token in cookie stored by browser is portable, either. How can web apps prevent the attackers exploiting the system from stealing the cookie token?
When different customers use different key to encrypt the data, even if the source is the same, the outcome is different. So it is not feasible to do de-duplication across different customers' data, unless all of them use the same key.
Does SpiderOak only provide backup service? Erasure encoding is efficient for cold data. Do you use erasure encoding to distribute the hot data across clusters?
I use patch queue[1] to manage these short lived branch, and it works for my purpose. You just pop the patches and delete them all when you want to prunge the branch. It also make it easy for others to review your code.
If these short-lived branch will be merged back shortly. Bookmark is another alternatives.
If I tries to shorten the url of http://google.com several times, goo.gl always give back different result. I just wonder will goo.gl merge theses url together sometime later?
This interesting found implies how goo.gl is designed. They prefer writing directly to avoid duplication check and random seek caused by the check. And they though most of the urls are cold so it is not essential to merge them together to keep the hot cache small.
Or they assume nobody wants to play the system in this way. :-)
The architecture of MegaStore is so complicated... There are so many roles in the system, e.g. stateless replicate server, different stateful paxos instances, stateful co-coordinator, bigtable and other auxilary roles.
I suspect some roles are added later because the original implementation does not meet their design goal, as patch to normal software product.
For any SQL/NoSQL system, the more RAM, the better. They need as much RAM as possible to cache the data.
If you observed cassandra consumes a lot of RAM even with small dataset, you should tune the GC settings. Besides it, JVM itself consumes a lot of RAM.
My guess: Gmail wants you to invite somebody in your contact list directly. And they are reluctant to reset the cap of invitation because there are so many users in the system.