Nati Shalom’s Blog: Why most large-scale Web sites are not written in Java
…similar solutions for addressing the scalability challenges:
On the Data Tier we see the following:
1. Adding a caching layer to take advantage of memory resources availability and reduce I/O overhead
2. Moving from a database-centric approach to partitioning, aka shards
On the Business Logic Tier:
3. Adding [...]

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More tiered compilation
… a repository of information collected from one run and used on another run is on the list for things we want to do in Dolphin. It’s actually on the runtime groups list but we will certainly take advantage of it. There has also been talk of using annotations to give the jit [...]

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This case study gives a high level overview of Google’s setup for user authentication, interesting read.
… user authentication is a transactional event that requires fast, reliable, scalable, persistence and robust high-availability. To deliver this level of service, Google Accounts uses Berkeley DB HA for the storage and retrieval of user data and for replication, thereby [...]

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