Add new primary and mirror in gp_segment_configuration as not-in-sync.

Under SEGWALREP, the mode for gp_segment_configuration is 'n' for
not-in-sync and 's' for in-sync.

When new primary or mirror is added to the cluster, the initial state of
the mode should be 'n' instead of 's' (in the original filerep mode.)

If mirror exists and synchronized with the primary, then the mode will
be updated to 's' to indicate the primary-mirror pair are in-sync.
Signed-off-by: NAshwin Agrawal <aagrawal@pivotal.io>

src/backend/utils/gp/segadmin.c

@@ -782,7 +782,11 @@ gp_add_segment_primary(PG_FUNCTION_ARGS)
 	new.db.dbid = get_availableDbId();
 	new.db.role = SEGMENT_ROLE_PRIMARY;
 	new.db.preferred_role = SEGMENT_ROLE_PRIMARY;
+#ifdef USE_SEGWALREP
+	new.db.mode = GP_SEGMENT_CONFIGURATION_MODE_NOTINSYNC;
+#else
 	new.db.mode = GP_SEGMENT_CONFIGURATION_MODE_INSYNC;
+#endif
 	new.db.status = GP_SEGMENT_CONFIGURATION_STATUS_UP;
 	new.db.filerep_port = -1;
 
@@ -853,6 +857,11 @@ gp_add_segment(PG_FUNCTION_ARGS)
 
 	mirroring_sanity_check(MASTER_ONLY | SUPERUSER, "gp_add_segment");
 
+#ifdef USE_SEGWALREP
+	new.db.mode = GP_SEGMENT_CONFIGURATION_MODE_NOTINSYNC;
+	elog(NOTICE, "mode is changed to GP_SEGMENT_CONFIGURATION_MODE_NOTINSYNC under walrep.");
+#endif
+
 	add_segment(new, fsmap);
 
 	PG_RETURN_INT16(new.db.dbid);
@@ -941,7 +950,11 @@ gp_add_segment_mirror(PG_FUNCTION_ARGS)
 	mirroring_sanity_check(MASTER_ONLY | SUPERUSER, "gp_add_segment_mirror");
 
 	new.db.dbid = get_availableDbId();
+#ifdef USE_SEGWALREP
+	new.db.mode = GP_SEGMENT_CONFIGURATION_MODE_NOTINSYNC;
+#else
 	new.db.mode = GP_SEGMENT_CONFIGURATION_MODE_INSYNC;
+#endif
 	new.db.status = GP_SEGMENT_CONFIGURATION_STATUS_UP;
 	new.db.role = SEGMENT_ROLE_MIRROR;
 	new.db.preferred_role = SEGMENT_ROLE_MIRROR;