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Include the backend ID in the relpath of temporary relations.

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This allows us to reliably remove all leftover temporary relation
files on cluster startup without reference to system catalogs or WAL;
therefore, we no longer include temporary relations in XLOG_XACT_COMMIT
and XLOG_XACT_ABORT WAL records.

Since these changes require including a backend ID in each
SharedInvalSmgrMsg, the size of the SharedInvalidationMessage.id
field has been reduced from two bytes to one, and the maximum number
of connections has been reduced from INT_MAX / 4 to 2^23-1.  It would
be possible to remove these restrictions by increasing the size of
SharedInvalidationMessage by 4 bytes, but right now that doesn't seem
like a good trade-off.

Review by Jaime Casanova and Tom Lane.
This commit is contained in:
Robert Haas
2010-08-13 20:10:54 +00:00
parent 3f9479ef3f
commit debcec7dc3
37 changed files with 669 additions and 343 deletions
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45
src/backend/utils/adt/dbsize.c
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@@ -5,7 +5,7 @@
* Copyright (c) 2002-2010, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/dbsize.c,v 1.32 2010/08/05 14:45:04 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/dbsize.c,v 1.33 2010/08/13 20:10:52 rhaas Exp $
*
*/
@@ -244,14 +244,14 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
* calculate size of (one fork of) a relation
*/
static int64
calculate_relation_size(RelFileNode *rfn, ForkNumber forknum)
calculate_relation_size(RelFileNode *rfn, BackendId backend, ForkNumber forknum)
{
int64 totalsize = 0;
char *relationpath;
char pathname[MAXPGPATH];
unsigned int segcount = 0;
relationpath = relpath(*rfn, forknum);
relationpath = relpathbackend(*rfn, backend, forknum);
for (segcount = 0;; segcount++)
{
@@ -291,7 +291,7 @@ pg_relation_size(PG_FUNCTION_ARGS)
rel = relation_open(relOid, AccessShareLock);
size = calculate_relation_size(&(rel->rd_node),
size = calculate_relation_size(&(rel->rd_node), rel->rd_backend,
forkname_to_number(text_to_cstring(forkName)));
relation_close(rel, AccessShareLock);
@@ -315,12 +315,14 @@ calculate_toast_table_size(Oid toastrelid)
/* toast heap size, including FSM and VM size */
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(toastRel->rd_node), forkNum);
size += calculate_relation_size(&(toastRel->rd_node),
toastRel->rd_backend, forkNum);
/* toast index size, including FSM and VM size */
toastIdxRel = relation_open(toastRel->rd_rel->reltoastidxid, AccessShareLock);
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(toastIdxRel->rd_node), forkNum);
size += calculate_relation_size(&(toastIdxRel->rd_node),
toastIdxRel->rd_backend, forkNum);
relation_close(toastIdxRel, AccessShareLock);
relation_close(toastRel, AccessShareLock);
@@ -349,7 +351,8 @@ calculate_table_size(Oid relOid)
* heap size, including FSM and VM
*/
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(rel->rd_node), forkNum);
size += calculate_relation_size(&(rel->rd_node), rel->rd_backend,
forkNum);
/*
* Size of toast relation
@@ -392,7 +395,9 @@ calculate_indexes_size(Oid relOid)
idxRel = relation_open(idxOid, AccessShareLock);
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(idxRel->rd_node), forkNum);
size += calculate_relation_size(&(idxRel->rd_node),
idxRel->rd_backend,
forkNum);
relation_close(idxRel, AccessShareLock);
}
@@ -563,6 +568,7 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
HeapTuple tuple;
Form_pg_class relform;
RelFileNode rnode;
BackendId backend;
char *path;
tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
@@ -600,12 +606,27 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
break;
}
if (!OidIsValid(rnode.relNode))
{
ReleaseSysCache(tuple);
PG_RETURN_NULL();
}
/* If temporary, determine owning backend. */
if (!relform->relistemp)
backend = InvalidBackendId;
else if (isTempOrToastNamespace(relform->relnamespace))
backend = MyBackendId;
else
{
/* Do it the hard way. */
backend = GetTempNamespaceBackendId(relform->relnamespace);
Assert(backend != InvalidBackendId);
}
ReleaseSysCache(tuple);
if (!OidIsValid(rnode.relNode))
PG_RETURN_NULL();
path = relpath(rnode, MAIN_FORKNUM);
path = relpathbackend(rnode, backend, MAIN_FORKNUM);
PG_RETURN_TEXT_P(cstring_to_text(path));
}