There are a couple issues with the current format:
1) We have to track the offset at checkpoint time and write the offset to a special location so we can seek to that offset during replay. In
FLUME-1516 we are tracking two offsets.
2) We have no way to detect partial writes FLUME-1967
3) We can only checksum the body of the event, not the entire record FLUME-1485 and therefore cannot detect corruption outside an event body.