Hi,
The replication slots data is stored in binary format on the disk under the pg_replslot/<<slot_name>> directory which isn't human readable. If the server is crashed/down (for whatever reasons) and unable to come up, currently there's no way for the user/admin/developer to know what were all the replication slots available at the time of server crash/down to figure out what's the restart lsn, xid, two phase info or types of slots etc.
pg_replslotdata is a tool that interprets the replication slots information and displays it onto the stdout even if the server is crashed/down. The design of this tool is similar to other tools available in the core today i.e. pg_controldata, pg_waldump.
Attaching initial patch herewith. I will improve it with documentation and other stuff a bit later.
Please see the attached picture for the sample output.
Thoughts?
Regards,
Bharath Rupireddy.
