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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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8
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.339 2010/08/05 14:45:01 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.340 2010/08/13 20:10:51 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@ -7165,13 +7165,13 @@ ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode)
* Relfilenodes are not unique across tablespaces, so we need to allocate
* a new one in the new tablespace.
*/
newrelfilenode = GetNewRelFileNode(newTableSpace, NULL);
newrelfilenode = GetNewRelFileNode(newTableSpace, NULL, rel->rd_backend);
/* Open old and new relation */
newrnode = rel->rd_node;
newrnode.relNode = newrelfilenode;
newrnode.spcNode = newTableSpace;
dstrel = smgropen(newrnode);
dstrel = smgropen(newrnode, rel->rd_backend);
RelationOpenSmgr(rel);
@ -7262,7 +7262,7 @@ copy_relation_data(SMgrRelation src, SMgrRelation dst,
/* XLOG stuff */
if (use_wal)
log_newpage(&dst->smgr_rnode, forkNum, blkno, page);
log_newpage(&dst->smgr_rnode.node, forkNum, blkno, page);
/*
* Now write the page. We say isTemp = true even if it's not a temp