On Fri, Aug 22, 2014 at 4:22 PM, Robert Haas <robertmh...@gmail.com> wrote:
>
> On Fri, Aug 22, 2014 at 2:32 PM, Alvaro Herrera
> <alvhe...@2ndquadrant.com> wrote:
> > Fabrízio de Royes Mello wrote:
> >> Em sexta-feira, 22 de agosto de 2014, Alvaro Herrera <
> >> alvhe...@2ndquadrant.com> escreveu:
> >>
> >> > Fabrízio de Royes Mello wrote:
> >> >
> >> > > I forgot to mention... I did again a lot of tests using different
> >> > > replication scenarios to make sure all is ok:
> >> > > - slaves async
> >> > > - slaves sync
> >> > > - cascade slaves
> >> >
> >> > On v13 you mean?
> >> >
> >> Exactly!
> >
> > Great. Pushed. Thanks for the patch.
>
> Hmm. I confess to not having paid enough attention to this, but:
>
> 1. Loggedness is not a word. I think that "persistence" or
> "relpersistence" would be better.
>
I changed to "Persistence"...
> 2. The patch seems to think that it can sometimes be safe to change
> the relpersistence of an existing relation. Unless you can be sure
> that no buffers can possibly be present in shared_buffers and nobody
> will use an existing relcache entry to read a new one in, it's not,
> because the buffers won't have the right BM_PERSISTENT marking. I'm
> very nervous about the fact that this patch seems not to have touched
> bufmgr.c, but maybe I'm missing something.
>
Because of this concern I implement a solution pointed by Andres [1].
Regards,
[1]
http://www.postgresql.org/message-id/20140717230220.gk21...@awork2.anarazel.de
--
Fabrízio de Royes Mello
Consultoria/Coaching PostgreSQL
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>> Blog: http://fabriziomello.github.io
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>> Github: http://github.com/fabriziomello
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index d37534e..5a233e2 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -152,7 +152,7 @@ typedef struct AlteredTableInfo
bool new_notnull; /* T if we added new NOT NULL constraints */
bool rewrite; /* T if a rewrite is forced */
Oid newTableSpace; /* new tablespace; 0 means no change */
- bool chgLoggedness; /* T if SET LOGGED/UNLOGGED is used */
+ bool chgPersistence; /* T if SET LOGGED/UNLOGGED is used */
char newrelpersistence; /* if above is true */
/* Objects to rebuild after completing ALTER TYPE operations */
List *changedConstraintOids; /* OIDs of constraints to rebuild */
@@ -388,8 +388,8 @@ static void change_owner_recurse_to_sequences(Oid relationOid,
static void ATExecClusterOn(Relation rel, const char *indexName,
LOCKMODE lockmode);
static void ATExecDropCluster(Relation rel, LOCKMODE lockmode);
-static bool ATPrepChangeLoggedness(Relation rel, bool toLogged);
-static void ATChangeIndexesLoggedness(Oid relid, char relpersistence);
+static bool ATPrepChangePersistence(Relation rel, bool toLogged);
+static void ATChangeIndexesPersistence(Oid relid, char relpersistence);
static void ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
char *tablespacename, LOCKMODE lockmode);
static void ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode);
@@ -3174,19 +3174,19 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
break;
case AT_SetLogged: /* SET LOGGED */
ATSimplePermissions(rel, ATT_TABLE);
- tab->chgLoggedness = ATPrepChangeLoggedness(rel, true);
+ tab->chgPersistence = ATPrepChangePersistence(rel, true);
tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
/* force rewrite if necessary */
- if (tab->chgLoggedness)
+ if (tab->chgPersistence)
tab->rewrite = true;
pass = AT_PASS_MISC;
break;
case AT_SetUnLogged: /* SET UNLOGGED */
ATSimplePermissions(rel, ATT_TABLE);
- tab->chgLoggedness = ATPrepChangeLoggedness(rel, false);
+ tab->chgPersistence = ATPrepChangePersistence(rel, false);
tab->newrelpersistence = RELPERSISTENCE_UNLOGGED;
/* force rewrite if necessary */
- if (tab->chgLoggedness)
+ if (tab->chgPersistence)
tab->rewrite = true;
pass = AT_PASS_MISC;
break;
@@ -3668,7 +3668,7 @@ ATRewriteTables(List **wqueue, LOCKMODE lockmode)
* Select persistence of transient table (same as original unless
* user requested a change)
*/
- persistence = tab->chgLoggedness ?
+ persistence = tab->chgPersistence ?
tab->newrelpersistence : OldHeap->rd_rel->relpersistence;
heap_close(OldHeap, NoLock);
@@ -3705,8 +3705,8 @@ ATRewriteTables(List **wqueue, LOCKMODE lockmode)
* because the rewrite step might read the indexes, and that would
* cause buffers for them to have the wrong setting.
*/
- if (tab->chgLoggedness)
- ATChangeIndexesLoggedness(tab->relid, tab->newrelpersistence);
+ if (tab->chgPersistence)
+ ATChangeIndexesPersistence(tab->relid, tab->newrelpersistence);
/*
* Swap the physical files of the old and new heaps, then rebuild
@@ -4119,7 +4119,7 @@ ATGetQueueEntry(List **wqueue, Relation rel)
tab->relkind = rel->rd_rel->relkind;
tab->oldDesc = CreateTupleDescCopy(RelationGetDescr(rel));
tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
- tab->chgLoggedness = false;
+ tab->chgPersistence = false;
*wqueue = lappend(*wqueue, tab);
@@ -10678,7 +10678,7 @@ ATExecGenericOptions(Relation rel, List *options)
* checks are skipped), otherwise true.
*/
static bool
-ATPrepChangeLoggedness(Relation rel, bool toLogged)
+ATPrepChangePersistence(Relation rel, bool toLogged)
{
Relation pg_constraint;
HeapTuple tuple;
@@ -10792,7 +10792,7 @@ ATPrepChangeLoggedness(Relation rel, bool toLogged)
* given persistence.
*/
static void
-ATChangeIndexesLoggedness(Oid relid, char relpersistence)
+ATChangeIndexesPersistence(Oid relid, char relpersistence)
{
Relation rel;
Relation pg_class;
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