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Fix temporary tablespaces for shared filesets some more.

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Commit ecd9e9f0b fixed the problem in the wrong place, causing unwanted
side-effects on the behavior of GetNextTempTableSpace().  Instead,
let's make SharedFileSetInit() responsible for subbing in the value
of MyDatabaseTableSpace when the default tablespace is called for.

The convention about what is in the tempTableSpaces[] array is
evidently insufficiently documented, so try to improve that.

It also looks like SharedFileSetInit() is doing the wrong thing in the
case where temp_tablespaces is empty.  It was hard-wiring use of the
pg_default tablespace, but it seems like using MyDatabaseTableSpace
is more consistent with what happens for other temp files.

Back-patch the reversion of PrepareTempTablespaces()'s behavior to
9.5, as ecd9e9f0b was.  The changes in SharedFileSetInit() go back
to v11 where that was introduced.  (Note there is net zero code change
before v11 from these two patch sets, so nothing to release-note.)

Magnus Hagander and Tom Lane

Discussion: https://postgr.es/m/CABUevExg5YEsOvqMxrjoNvb3ApVyH+9jggWGKwTDFyFCVWczGQ@mail.gmail.com
This commit is contained in:
Tom Lane
2020-07-03 17:01:34 -04:00
parent 4aa02d0729
commit 79ed1d99d7
3 changed files with 34 additions and 5 deletions
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18
src/backend/storage/file/sharedfileset.c
View File

@ -61,9 +61,25 @@ SharedFileSetInit(SharedFileSet *fileset, dsm_segment *seg)
lengthof(fileset->tablespaces));
if (fileset->ntablespaces == 0)
{
fileset->tablespaces[0] = DEFAULTTABLESPACE_OID;
/* If the GUC is empty, use current database's default tablespace */
fileset->tablespaces[0] = MyDatabaseTableSpace;
fileset->ntablespaces = 1;
}
else
{
int i;
/*
* An entry of InvalidOid means use the default tablespace for the
* current database. Replace that now, to be sure that all users of
* the SharedFileSet agree on what to do.
*/
for (i = 0; i < fileset->ntablespaces; i++)
{
if (fileset->tablespaces[i] == InvalidOid)
fileset->tablespaces[i] = MyDatabaseTableSpace;
}
}
/* Register our cleanup callback. */
on_dsm_detach(seg, SharedFileSetOnDetach, PointerGetDatum(fileset));