Hi, My colleague Richard Yen came across this situation:
pg_restore: [archiver (db)] could not execute query: ERROR: cannot
assign XIDs during a parallel operation
Command was: -- For binary upgrade, create an empty extension and
insert objects into it
DROP EXTENSION IF EXISTS "btree_gin";
SELECT pg_catalog.binary_upgrade_create_empty_extension('btree_gin',
'public', true, '1.0', NULL, NULL, ARRAY[]::pg_catalog.text[]);
It turned out that the target cluster was running with
force_parallel_mode = on. Here's a single character patch to mark
that function PARALLEL UNSAFE. Obviously that'll affect only newly
initdb'd clusters after this patch, but that's what people have in a
pg_upgrade scenario.
This goes back to d89f06f0482 so I think it should probably be
back-patched to 9.6 and 10.
--
Thomas Munro
http://www.enterprisedb.com
0001-Mark-binary_upgrade_create_empty_extension-PARALLEL-.patch
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