On Thu, Aug 18, 2016 at 1:35 AM, Alvaro Herrera
<alvhe...@2ndquadrant.com> wrote:
> I don't remember how pg_snapshot works, but it's probably fine
> to start with an empty subdir (is it possible to export a snapshot from
> a prepared transaction?)

>From xact.c:
     * Likewise, don't allow PREPARE after pg_export_snapshot.  This could be
     * supported if we added cleanup logic to twophase.c, but for now it
     * doesn't seem worth the trouble.
    if (XactHasExportedSnapshots())
        errmsg("cannot PREPARE a transaction that has exported snapshots")));
So that's fine.

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