Re: Logging the fact that a log was shipped

## Stephen Frost (sfrost(at)snowman(dot)net):

> Worse, such scripts run the serious risk of losing WAL if a crash
> happens because nothing is ensuring that the WAL has been sync'd to disk
> before returning from the archive_command.

That risk already exists when using rsync/scp/scp/... and should be
mitigated by filesystem settings on the receiving side.

> Most of the existing tools for dealing with WAL archival (pgbackrest,
> barman and WAL-E, at least) already log successful and unsuccessful
> archive command runs. I'm pretty sure barman supports back to 8.4 and I
> know pgbackrest does.

Barman would have to use rsync for the archiving with PostgreSQL 8.4
(pg_receivexlog only came along in 9.2, replication slots in 9.4).
Logging will not happen on completion of archive_command (barman
doesn't know much about that) but only when the xlog segment is
being processed by barman - which could be quite some time later.

Regards,
Christoph

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