On Fri, Sep 15, 2017 at 8:23 AM, Andreas Joseph Krogh
<andr...@visena.com> wrote:
> I tested upgrading from 9.6 to 10 now, using pg_upgrade, and pg_upgrade
> creates the new data-dir with pg_wal "in it" (just like regular initdb), so
> pg_upgrade seems not to care about where the old version's pg_xlog was. You
> have to move (by symlinking) pg_wal to a separate location manually *after*
> running pg_upgrade on the master.

That's true, this should definitely be mentioned in the documentation.
An improvement could be done as well here for pg_upgrade: when using
--link, the new PGDATA created could consider as well the source
pg_wal and create a link to it, and then clean up its contents. I am
not completely sure if this would be worth doing as people are likely
used to the current flow though. The documentation needs to outline
the matter at least.

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