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Commit1752e35

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Fix parallel restore of FKs to partitioned tables
When an FK constraint is created, it needs the index on the referencedtable to exist and be valid. When doing parallel pg_restore and thereferenced table was partitioned, this condition can sometimes not bemet, because pg_dump didn't emit sufficient object dependencies toensure so; this means that parallel pg_restore would fail in certainconditions. Fix by having pg_dump make the FK constraint objectdependent on the partition attachment objects for the constraint'sreferenced index.This has been broken sincef56f8f8, so backpatch to Postgres 12.Discussion:https://postgr.es/m/20191005224333.GA9738@alvherre.pgsql
1 parent3c8c55d commit1752e35

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5 files changed

+82
-5
lines changed

5 files changed

+82
-5
lines changed

‎src/bin/pg_dump/common.c

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -412,6 +412,9 @@ flagInhIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
412412
addObjectDependency(&attachinfo[k].dobj,
413413
parentidx->indextable->dobj.dumpId);
414414

415+
/* keep track of the list of partitions in the parent index */
416+
simple_ptr_list_append(&parentidx->partattaches,&attachinfo[k].dobj);
417+
415418
k++;
416419
}
417420
}

‎src/bin/pg_dump/pg_dump.c

Lines changed: 40 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7115,6 +7115,7 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
71157115
indxinfo[j].indisclustered = (PQgetvalue(res, j, i_indisclustered)[0] == 't');
71167116
indxinfo[j].indisreplident = (PQgetvalue(res, j, i_indisreplident)[0] == 't');
71177117
indxinfo[j].parentidx = atooid(PQgetvalue(res, j, i_parentidx));
7118+
indxinfo[j].partattaches = (SimplePtrList) { NULL, NULL };
71187119
contype = *(PQgetvalue(res, j, i_contype));
71197120

71207121
if (contype == 'p' || contype == 'u' || contype == 'x')
@@ -7256,6 +7257,7 @@ getConstraints(Archive *fout, TableInfo tblinfo[], int numTables)
72567257
i_conoid,
72577258
i_conname,
72587259
i_confrelid,
7260+
i_conindid,
72597261
i_condef;
72607262
intntups;
72617263

@@ -7281,7 +7283,7 @@ getConstraints(Archive *fout, TableInfo tblinfo[], int numTables)
72817283
resetPQExpBuffer(query);
72827284
if (fout->remoteVersion >= 110000)
72837285
appendPQExpBuffer(query,
7284-
"SELECT tableoid, oid, conname, confrelid, "
7286+
"SELECT tableoid, oid, conname, confrelid,conindid,"
72857287
"pg_catalog.pg_get_constraintdef(oid) AS condef "
72867288
"FROM pg_catalog.pg_constraint "
72877289
"WHERE conrelid = '%u'::pg_catalog.oid "
@@ -7290,7 +7292,7 @@ getConstraints(Archive *fout, TableInfo tblinfo[], int numTables)
72907292
tbinfo->dobj.catId.oid);
72917293
else
72927294
appendPQExpBuffer(query,
7293-
"SELECT tableoid, oid, conname, confrelid, "
7295+
"SELECT tableoid, oid, conname, confrelid,0 as conindid,"
72947296
"pg_catalog.pg_get_constraintdef(oid) AS condef "
72957297
"FROM pg_catalog.pg_constraint "
72967298
"WHERE conrelid = '%u'::pg_catalog.oid "
@@ -7304,12 +7306,15 @@ getConstraints(Archive *fout, TableInfo tblinfo[], int numTables)
73047306
i_conoid = PQfnumber(res, "oid");
73057307
i_conname = PQfnumber(res, "conname");
73067308
i_confrelid = PQfnumber(res, "confrelid");
7309+
i_conindid = PQfnumber(res, "conindid");
73077310
i_condef = PQfnumber(res, "condef");
73087311

73097312
constrinfo = (ConstraintInfo *) pg_malloc(ntups * sizeof(ConstraintInfo));
73107313

73117314
for (j = 0; j < ntups; j++)
73127315
{
7316+
TableInfo *reftable;
7317+
73137318
constrinfo[j].dobj.objType = DO_FK_CONSTRAINT;
73147319
constrinfo[j].dobj.catId.tableoid = atooid(PQgetvalue(res, j, i_contableoid));
73157320
constrinfo[j].dobj.catId.oid = atooid(PQgetvalue(res, j, i_conoid));
@@ -7326,6 +7331,39 @@ getConstraints(Archive *fout, TableInfo tblinfo[], int numTables)
73267331
constrinfo[j].condeferred = false;
73277332
constrinfo[j].conislocal = true;
73287333
constrinfo[j].separate = true;
7334+
7335+
/*
7336+
* Restoring an FK that points to a partitioned table requires
7337+
* that all partition indexes have been attached beforehand.
7338+
* Ensure that happens by making the constraint depend on each
7339+
* index partition attach object.
7340+
*/
7341+
reftable = findTableByOid(constrinfo[j].confrelid);
7342+
if (reftable && reftable->relkind == RELKIND_PARTITIONED_TABLE)
7343+
{
7344+
IndxInfo *refidx;
7345+
OidindexOid = atooid(PQgetvalue(res, j, i_conindid));
7346+
7347+
if (indexOid != InvalidOid)
7348+
{
7349+
for (int k = 0; k < reftable->numIndexes; k++)
7350+
{
7351+
SimplePtrListCell *cell;
7352+
7353+
/* not our index? */
7354+
if (reftable->indexes[k].dobj.catId.oid != indexOid)
7355+
continue;
7356+
7357+
refidx = &reftable->indexes[k];
7358+
for (cell = refidx->partattaches.head; cell;
7359+
cell = cell->next)
7360+
addObjectDependency(&constrinfo[j].dobj,
7361+
((DumpableObject *)
7362+
cell->ptr)->dumpId);
7363+
break;
7364+
}
7365+
}
7366+
}
73297367
}
73307368

73317369
PQclear(res);

‎src/bin/pg_dump/pg_dump.h

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -367,6 +367,8 @@ typedef struct _indxInfo
367367
boolindisclustered;
368368
boolindisreplident;
369369
Oidparentidx;/* if partitioned, parent index OID */
370+
SimplePtrListpartattaches;/* if partitioned, partition attach objects */
371+
370372
/* if there is an associated constraint object, its dumpId: */
371373
DumpIdindexconstraint;
372374
}IndxInfo;

‎src/fe_utils/simple_list.c

Lines changed: 21 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -152,3 +152,24 @@ simple_string_list_not_touched(SimpleStringList *list)
152152
}
153153
returnNULL;
154154
}
155+
156+
/*
157+
* Append a pointer to the list.
158+
*
159+
* Caller must ensure that the pointer remains valid.
160+
*/
161+
void
162+
simple_ptr_list_append(SimplePtrList*list,void*ptr)
163+
{
164+
SimplePtrListCell*cell;
165+
166+
cell= (SimplePtrListCell*)pg_malloc(sizeof(SimplePtrListCell));
167+
cell->next=NULL;
168+
cell->ptr=ptr;
169+
170+
if (list->tail)
171+
list->tail->next=cell;
172+
else
173+
list->head=cell;
174+
list->tail=cell;
175+
}

‎src/include/fe_utils/simple_list.h

Lines changed: 16 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -2,9 +2,9 @@
22
*
33
* Simple list facilities for frontend code
44
*
5-
* Data structures for simple lists of OIDsandstrings. The support for
6-
* these is very primitive compared to the backend's List facilities, but
7-
* it's all we need in, eg, pg_dump.
5+
* Data structures for simple lists of OIDs, strings,andpointers. The
6+
*support forthese is very primitive compared to the backend's List
7+
*facilities, butit's all we need in, eg, pg_dump.
88
*
99
*
1010
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
@@ -43,6 +43,17 @@ typedef struct SimpleStringList
4343
SimpleStringListCell*tail;
4444
}SimpleStringList;
4545

46+
typedefstructSimplePtrListCell
47+
{
48+
structSimplePtrListCell*next;
49+
void*ptr;
50+
}SimplePtrListCell;
51+
52+
typedefstructSimplePtrList
53+
{
54+
SimplePtrListCell*head;
55+
SimplePtrListCell*tail;
56+
}SimplePtrList;
4657

4758
externvoidsimple_oid_list_append(SimpleOidList*list,Oidval);
4859
externboolsimple_oid_list_member(SimpleOidList*list,Oidval);
@@ -54,4 +65,6 @@ extern void simple_string_list_destroy(SimpleStringList *list);
5465

5566
externconstchar*simple_string_list_not_touched(SimpleStringList*list);
5667

68+
externvoidsimple_ptr_list_append(SimplePtrList*list,void*val);
69+
5770
#endif/* SIMPLE_LIST_H */

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