SERVER-29428 Have mongod fail gracefully when featureCompatibilityVersion is of a higher version

(cherry picked from commit b35c6fc183c26bc8a6d7cdfc8f5b970f90d60b56)

1 files changed, 15 insertions, 2 deletions

diff --git a/src/mongo/executor/network_interface_asio_auth.cpp b/src/mongo/executor/network_interface_asio_auth.cpp
index 1f2039dbd1e..81f9ab9d841 100644
--- a/src/mongo/executor/network_interface_asio_auth.cpp
+++ b/src/mongo/executor/network_interface_asio_auth.cpp
@@ -38,6 +38,7 @@
 #include "mongo/db/auth/authorization_manager_global.h"
 #include "mongo/db/auth/internal_user_auth.h"
 #include "mongo/db/commands.h"
+#include "mongo/db/commands/feature_compatibility_version_command_parser.h"
 #include "mongo/db/server_options.h"
 #include "mongo/db/wire_version.h"
 #include "mongo/rpc/factory.h"
@@ -46,8 +47,10 @@
 #include "mongo/rpc/metadata/client_metadata.h"
 #include "mongo/rpc/reply_interface.h"
 #include "mongo/stdx/memory.h"
+#include "mongo/util/exit.h"
 #include "mongo/util/log.h"
 #include "mongo/util/net/ssl_manager.h"
+#include "mongo/util/quick_exit.h"
 #include "mongo/util/version.h"
 
 namespace mongo {
@@ -116,9 +119,19 @@ void NetworkInterfaceASIO::_runIsMaster(AsyncOp* op) {
         auto validateStatus =
             rpc::validateWireVersion(WireSpec::instance().outgoing, protocolSet.getValue().version);
         if (!validateStatus.isOK()) {
-            warning() << "remote host has incompatible wire version: " << validateStatus;
 
-            return _completeOperation(op, validateStatus);
+            if (WireSpec::instance().isInternalClient) {
+                severe() << "remote host has incompatible wire version: " << validateStatus;
+                severe() << "Please consult the documentation for upgrading this server: "
+                         << "http://dochub.mongodb.org/core/3.6-feature-compatibility";
+
+                // Exit if mongod should be upgraded.
+                quickExit(EXIT_NEED_UPGRADE);
+            } else {
+                warning() << "remote host has incompatible wire version: " << validateStatus;
+
+                return _completeOperation(op, validateStatus);
+            }
         }
 
         op->connection().setServerProtocols(protocolSet.getValue().protocolSet);