I have synchronous replication between db server, DB1 and DB2. Tested, working. I have a redis server (RD1), integrated with DB1 (master) via redis_fdw, no issues here. I was expecting foreign redis table to by synched between DB1 and DB2 after sync replication but it does not. I can see the table on DB2 (slave) when I type "\d" in slave psql but when I want to select records, I get: "ERROR: could not access file "$libdir/redis_fdw": No such file or directory". The question is, how can I get redis updates from postgresql slave via postgresql sync. It is possible? I can integrate the slave DB with redis server but that would break the DB sync. Thanks.
a Foreign Data Wrapper (fdw) point and interpret the data (keep no data),its like a view. Is the redis_fdw compiled on the slave side? if not complile it and master and salve points to your RD1-Table.