Rename logical decoding's pg_llog directory to pg_logical.

The old name wasn't very descriptive as of actual contents of the
directory, which are historical snapshots in the snapshots/
subdirectory and mappingdata for rewritten tuples in
mappings/. There's been a fair amount of discussion what would be a
good name. I'm settling for pg_logical because it's likely that
further data around logical decoding and replication will need saving
in the future.

Also add the missing entry for the directory into storage.sgml's list
of PGDATA contents.

Bumps catversion as the data directories won't be compatible.

Backpatch to 9.4, which I missed to do as Michael Paquier luckily
noticed. As there already has been a catversion bump after 9.4beta1,
there's no reasons for having 9.4 diverge from master.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index fc1ab1b0ee5..2b0929cb78b 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -2795,7 +2795,7 @@ ApplyLogicalMappingFile(HTAB *tuplecid_data, Oid relid, const char *fname)
 	int			readBytes;
 	LogicalRewriteMappingData map;
 
-	sprintf(path, "pg_llog/mappings/%s", fname);
+	sprintf(path, "pg_logical/mappings/%s", fname);
 	fd = OpenTransientFile(path, O_RDONLY | PG_BINARY, 0);
 	if (fd < 0)
 		ereport(ERROR,
@@ -2915,8 +2915,8 @@ UpdateLogicalMappings(HTAB *tuplecid_data, Oid relid, Snapshot snapshot)
 	size_t		off;
 	Oid			dboid = IsSharedRelation(relid) ? InvalidOid : MyDatabaseId;
 
-	mapping_dir = AllocateDir("pg_llog/mappings");
-	while ((mapping_de = ReadDir(mapping_dir, "pg_llog/mappings")) != NULL)
+	mapping_dir = AllocateDir("pg_logical/mappings");
+	while ((mapping_de = ReadDir(mapping_dir, "pg_logical/mappings")) != NULL)
 	{
 		Oid			f_dboid;
 		Oid			f_relid;