Hello, We have few highly available clusters with patroni managing PostgreSQL 9.6 (pgdg on debian stretch). We use logical decoding with wal2json to stream data to a remote platform. On a majority of clusters, it works like a charm. But for one, we have the following error right after decoding start: [1353-1] LOG: starting logical decoding for slot "*****" [1353-2] DETAIL: streaming transactions committing after 321/292C06F0, reading WAL from 321/28BA9898 [1354-1] LOG: logical decoding found consistent point at 321/28BA9898 [1354-2] DETAIL: There are no running transactions. [1355-1] ERROR: no known snapshots [1355-2] CONTEXT: slot "*****", output plugin "wal2json", in the change callback, associated LSN 321/2A985A30 The only reference of the "no known snapshots" error is in PostgreSQL source code: https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/access/heap/tuptoaster.c;h=ade4bd142dfbd7ef3340495b06d1041e4032a17f;hb=ca3489e768990e32096f0f24d46d5f0b8b70cff4#l2320 Do you know what can cause this error? Julien
