Require pg_receivewal to use an existing replication slot (see Section 26.2.6 of the PostgreSQL manual). When this option is used, pg_receivewal will report a flush position to the server, indicating when each segment has been synchronized to disk so that the server can remove that segment if it is not otherwise needed.
When the replication client of pg_receivewal is configured on the server as a synchronous standby, then using a replication slot will report the flush position to the server, but only when a WAL file is closed. Therefore, that configuration will cause transactions on the primary to wait for a long time and effectively not work satisfactorily. The option synchronous must be specified in addition to make this work correctly.
Declarations
Type
stringDefault
""Example
"some_slot_name"