[Bug 1366104] Re: OperationError when large object greater than 2gb

[Daniele Varrazzo]

Because it uses a new libpq api. Specifically the new api is only
available from libpq 9.3: If the package is built against libpq 9.3 and
is used on a client that has an older libpq version it will fail import.
More details at
<https://github.com/psycopg/psycopg2/pull/259#issuecomment-55209844>.
Probably your "large MAAS cluster" has verified it with its own setup
but not with older libpq versions.

>From the psycopg PoV the LO64 support is a new feature that will only be
introduced in psycopg 2.6. IMO MAAS should install psycopg from pip or
from upstream instead of using the Ubuntu one, which is painfully out of
date.

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https://bugs.launchpad.net/bugs/1366104

Title:
  OperationError when large object greater than 2gb

Status in MAAS:
  Fix Committed
Status in “psycopg2” package in Ubuntu:
  Incomplete

Bug description:
  If a large object is greater than 2gb then calls to seek and tell will
  fail with an OperationError. This is because of the use of lseek and
  ltell instead of the lseek64 and ltell64.

  Attached is the upstream issue and pull request.

  https://github.com/psycopg/psycopg2/pull/259

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