Brandon Mochama
Enjoyer of Go, Rust, Python, Databases & SQL
Software developer with a focus on PostgreSQL, Python & Golang. Writes about Postgres, Duckdb, query patterns, DB internals and data modeling at https://bnmoch3.org/.
POSETTE 2026 Talk
Logical Decoding Protocol V2: Streaming Transactions, Schema Changes, Backfills and more
My talk will examine the practical details of implementing a logical decoding consumer, drawing from my experience in building a client in Go using pglogrepl and from studying production CDC systems like PeerDB and Dolt. Since there are many talks, blog posts and docs that provide overviews, I want to specifically cover the non-obvious and undocumented tidbits on logical decoding that I encountered. Specifically:
- Protocol V2 streaming semantics: handling interleaved transaction chunks, the StreamStart/StreamStop/StreamCommit message sequence, and why duplicate StreamAbort messages occur
- TOAST column handling: the 'u' (unchanged) tuple type, backfill strategies, and the REPLICA IDENTITY tradeoffs different systems make
- DDL & Schema change detection: reactive vs proactive, using RelationMessage deltas rather than DDL parsing, and how PeerDB propagates column additions to destinations
- Initial data sync: leveraging the exported snapshot from slot creation for consistent backfills without race conditions
- And more...
The talk assumes some familiarity with PG replication concepts and is aimed at developers building or maintaining CDC pipelines.
I have been writing about PostgreSQL on my blog for several years, this will be my first conference talk.
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