Facebook has been using RocksDB more and more (now messenger, but also Instragram’s flavor of Cassandra). I wonder if Google has a similar penetration of LevelDB (and we just don’t hear about it because Google’s infrastructure work isn’t open source)
There seems to be a pattern with Google: they have internal infrastructure that every ex-Googler seem to miss when they leave the company, because it's so good that it felt like being 10 years in the future.
As far as I understand, Google doesn't have a bunch of tools that merely work together, they have one huge system with different bits that _live_ together, so much that separating and open-sourcing them is cool but won't give you the same thing as being from inside:
- They use Blaze, a build system that integrates directly with the object store. They open-sourced Bazel as a kind of equivalent, but the build system won't shine unless you have an integrated object store and an integrated vcs client
- They have open-sourced Kubernetes, a successor of what they were using for they were using internally for cloud management
- They have open-sourced LevelDB, a successor of the fundamental brick they are using for BigTable
So in a way LevelDB isn't used as-is inside Google, but its spirit is in use at a fundamental level by pretty much everyone
No, it does not. Generally speaking, Google "converges" a layer up (BigTable, Spanner, Colossus). There is no layer like LevelDB that is common to all of these.
