Reading Tom's posting here:
http://archives.postgresql.org/pgsql-general/2006-04/msg00499.php

I just realised we don't seem to mention this in the docs anywhere. I
propose adding a short paragraph to 23.3.1
http://www.postgresql.org/docs/8.1/static/backup-online.html#BACKUP-ONLINE-CAVEATS

After "Except in the case of retrying a failure, it will be called only
once for any given file name."

To identify the current, partially-filled WAL segment, sort first by
mtime and second by file name. That is, take the latest mtime among the
properly-named files, breaking ties by taking the higher filename.

--
  Richard Huxton
  Archonet Ltd


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