a flumelog implemented on top of leveldb.
Use as the append-only store within flumedb
leveldb is a Log Structured Merge Tree, so using it just as a log is rather silly, but as a matter of ensuring a broad base of compatible backend, and to explore the problem space...
And also to compare performance. If you had built a complex leveldb app, you might already have a log inside of it. This enables us to do comparative performance between implementations.