I got it, thank you.
Can you recommend what to use to determine which quorum standby should be promoted in such case?
We planned to use pg_last_wal_receive_lsn() to determine which has fresh data but if it returns the beginning of the segment on both replicas we can’t determine which standby confirmed that write transaction to disk.
On 8 May 2020, at 14:50, Sergei Kornilov <
sk@zsrv.org> wrote:
Hello
Yes, this is expected. Walreceiver always start streaming from beginning of the wal segment.
./src/backend/replication/walreceiverfuncs.c in RequestXLogStreaming:
* We always start at the beginning of the segment. That prevents a broken
* segment (i.e., with no records in the first half of a segment) from
* being created by XLOG streaming, which might cause trouble later on if
* the segment is e.g archived.
regards, Sergei
