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Prevent loss of init fork when truncating an unlogged table.

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Fixes bug #6635, reported by Akira Kurosawa.
This commit is contained in:
Robert Haas 2012-05-11 09:46:42 -04:00
parent b762e8f50b
commit 1331cc6c1a
3 changed files with 23 additions and 15 deletions
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32
src/backend/catalog/heap.c
View File

@ -1306,24 +1306,10 @@ heap_create_with_catalog(const char *relname,
if (oncommit != ONCOMMIT_NOOP)
register_on_commit_action(relid, oncommit);
/*
* If this is an unlogged relation, it needs an init fork so that it can
* be correctly reinitialized on restart. Since we're going to do an
* immediate sync, we only need to xlog this if archiving or streaming is
* enabled. And the immediate sync is required, because otherwise there's
* no guarantee that this will hit the disk before the next checkpoint
* moves the redo pointer.
*/
if (relpersistence == RELPERSISTENCE_UNLOGGED)
{
Assert(relkind == RELKIND_RELATION || relkind == RELKIND_TOASTVALUE);
RelationOpenSmgr(new_rel_desc);
smgrcreate(new_rel_desc->rd_smgr, INIT_FORKNUM, false);
if (XLogIsNeeded())
log_smgrcreate(&new_rel_desc->rd_smgr->smgr_rnode.node,
INIT_FORKNUM);
smgrimmedsync(new_rel_desc->rd_smgr, INIT_FORKNUM);
heap_create_init_fork(new_rel_desc);
}
/*
@ -1336,6 +1322,22 @@ heap_create_with_catalog(const char *relname,
return relid;
}
/*
* Set up an init fork for an unlogged table so that it can be correctly
* reinitialized on restart. Since we're going to do an immediate sync, we
* only need to xlog this if archiving or streaming is enabled. And the
* immediate sync is required, because otherwise there's no guarantee that
* this will hit the disk before the next checkpoint moves the redo pointer.
*/
void
heap_create_init_fork(Relation rel)
{
RelationOpenSmgr(rel);
smgrcreate(rel->rd_smgr, INIT_FORKNUM, false);
if (XLogIsNeeded())
log_smgrcreate(&rel->rd_smgr->smgr_rnode.node, INIT_FORKNUM);
smgrimmedsync(rel->rd_smgr, INIT_FORKNUM);
}
/*
* RelationRemoveInheritance

4
src/backend/commands/tablecmds.c
View File

@ -1155,6 +1155,8 @@ ExecuteTruncate(TruncateStmt *stmt)
* deletion at commit.
*/
RelationSetNewRelfilenode(rel, RecentXmin);
if (rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED)
heap_create_init_fork(rel);
heap_relid = RelationGetRelid(rel);
toast_relid = rel->rd_rel->reltoastrelid;
@ -1166,6 +1168,8 @@ ExecuteTruncate(TruncateStmt *stmt)
{
rel = relation_open(toast_relid, AccessExclusiveLock);
RelationSetNewRelfilenode(rel, RecentXmin);
if (rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED)
heap_create_init_fork(rel);
heap_close(rel, NoLock);
}

2
src/include/catalog/heap.h
View File

@ -69,6 +69,8 @@ extern Oid heap_create_with_catalog(const char *relname,
bool use_user_acl,
bool allow_system_table_mods);
extern void heap_create_init_fork(Relation rel);
extern void heap_drop_with_catalog(Oid relid);
extern void heap_truncate(List *relids);