The key word you're misunderstanding is "filled". It means it doesn't wait for the 16MB file to be completely filled with records. I.e. what would happen in the file shipping form of replication.
- [HACKERS] Streaming replication Tatsuo Ishii
- Re: [HACKERS] Streaming replication Mark Kirkwood
- Re: [HACKERS] Streaming replication Tatsuo Ishii
- Re: [HACKERS] Streaming replication Greg Stark