SERVER-45692 add explicit RWC to inter-node commands (even if merely kImplicitDefault)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mongo/db/write_concern_options.cpp b/src/mongo/db/write_concern_options.cpp
index 298941fbdef..7ff06c9d224 100644
--- a/src/mongo/db/write_concern_options.cpp
+++ b/src/mongo/db/write_concern_options.cpp
@@ -72,6 +72,12 @@ const BSONObj WriteConcernOptions::Default = BSONObj();
 const BSONObj WriteConcernOptions::Acknowledged(BSON("w" << W_NORMAL));
 const BSONObj WriteConcernOptions::Unacknowledged(BSON("w" << W_NONE));
 const BSONObj WriteConcernOptions::Majority(BSON("w" << WriteConcernOptions::kMajority));
+
+// The "kImplicitDefault" write concern, used by internal operations, is deliberately empty (no
+// 'w' or 'wtimeout' specified). This allows internal operations to specify a write concern, while
+// still allowing it to be either w:1 or automatically upconverted to w:majority on configsvrs.
+const BSONObj WriteConcernOptions::kImplicitDefault;
+
 constexpr Seconds WriteConcernOptions::kWriteConcernTimeoutSystem;
 constexpr Seconds WriteConcernOptions::kWriteConcernTimeoutMigration;
 constexpr Seconds WriteConcernOptions::kWriteConcernTimeoutSharding;