I don’t think I’ve written about Google’s Megastore yet, so here’s a quick summary of worthwile resources.
Megastore is the data engine supporting the Google Application Engine. It’s a scalable structured data store providing full ACID semantics within partitions but lower consistency guarantees across partitions.
James Hamilton’s take on Google Megastore: The Data Engine Behind GAE. His blog is worth following for people interested in scaling infrastructure in general, not just DBs. Todd Hoff’s write-up is about Google Megastore – 3 Billion Writes and 20 Billion Read Transactions Daily, his blog is about everything High Scalability. And last but not least the Storage Mojo take on Google’s Megastore, from a storage insider.