database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-13 07:41:39 +03:00
Code Activity

Prevent loss of init fork when truncating an unlogged table.

Browse Source 
Fixes bug #6635, reported by Akira Kurosawa.
This commit is contained in:
Robert Haas
2012-05-11 09:46:42 -04:00
parent f93e45d407
commit 2ca6bac892
3 changed files with 23 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
src/backend/catalog/heap.c
View File

@ -1290,24 +1290,10 @@ 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);
}
/*
@ -1320,6 +1306,22 @@ 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

@ -1059,6 +1059,8 @@ 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;
@ -1070,6 +1072,8 @@ 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);
}