Citus support for WAL queries

[tobyfielding1]

Hello folks,

I am using LSNs to ensure relevant data has replicated from the primary to the secondary in a read replica setup for read-after-write consistency (without citus) and contemplating moving to citus. I haven't been able to find anything in the docs about whether WAL operations such as pg_current_wal_lsn() are supported in citus. Presumably each citus node has its own WAL, is there a shared logical WAL which citus uses, allowing me to continue using this approach, or are such queries impossible?

For context, the approach I am taking is explained here: https://brandur.org/postgres-reads

Thanks in advance!