Hi Bertrand,
25.04.2024 10:20, Bertrand Drouvot wrote:
> postgres=# CREATE FUNCTION f() RETURNS int LANGUAGE SQL RETURN f() + 1;
> ERROR: cache lookup failed for function 16400
>
> This stuff does appear before we get a chance to call the new depLockAndCheckObject()
> function.
>
> I think this is what Tom was referring to in [1]:
>
> "
> So the only real fix for this would be to make every object lookup in the entire
> system do the sort of dance that's done in RangeVarGetRelidExtended.
> "
>
> The fact that those kind of errors appear also somehow ensure that no orphaned
> dependencies can be created.
I agree; the only thing that I'd change here, is the error code.
But I've discovered yet another possibility to get a broken dependency.
Please try this script:
res=0
numclients=20
for ((i=1;i<=100;i++)); do
for ((c=1;c<=numclients;c++)); do
echo "
CREATE SCHEMA s_$c;
CREATE CONVERSION myconv_$c FOR 'LATIN1' TO 'UTF8' FROM iso8859_1_to_utf8;
ALTER CONVERSION myconv_$c SET SCHEMA s_$c;
" | psql >psql1-$c.log 2>&1 &
echo "DROP SCHEMA s_$c RESTRICT;" | psql >psql2-$c.log 2>&1 &
done
wait
pg_dump -f db.dump || { echo "on iteration $i"; res=1; break; }
for ((c=1;c<=numclients;c++)); do
echo "DROP SCHEMA s_$c CASCADE;" | psql >psql3-$c.log 2>&1
done
done
psql -c "SELECT * FROM pg_conversion WHERE connamespace NOT IN (SELECT oid FROM pg_namespace);"
It fails for me (with the v4 patch applied) as follows:
pg_dump: error: schema with OID 16392 does not exist
on iteration 1
oid | conname | connamespace | conowner | conforencoding | contoencoding | conproc | condefault
-------+----------+--------------+----------+----------------+---------------+-------------------+------------
16396 | myconv_6 | 16392 | 10 | 8 | 6 | iso8859_1_to_utf8 | f
Best regards,
Alexander