SERVER-29649 Add startupWarning for replset running with --nojournal when writeConcernMajorityJournalDefault is not false

1 files changed, 18 insertions, 0 deletions

diff --git a/src/mongo/db/repl/replication_coordinator_impl.cpp b/src/mongo/db/repl/replication_coordinator_impl.cpp
index 5d8fee72e3e..9ffbed75ae3 100644
--- a/src/mongo/db/repl/replication_coordinator_impl.cpp
+++ b/src/mongo/db/repl/replication_coordinator_impl.cpp
@@ -2795,6 +2795,24 @@ ReplicationCoordinatorImpl::_setCurrentRSConfig_inlock(OperationContext* opCtx,
         log() << "**          in a future version." << startupWarningsLog;
     }
 
+    // Warn if running --nojournal and writeConcernMajorityJournalDefault = false
+    StorageEngine* storageEngine = opCtx->getServiceContext()->getGlobalStorageEngine();
+    if (!storageEngine->isDurable() &&
+        (newConfig.getWriteConcernMajorityShouldJournal() &&
+         (!oldConfig.isInitialized() || !oldConfig.getWriteConcernMajorityShouldJournal()))) {
+        log() << startupWarningsLog;
+        log() << "** WARNING: This replica set is running without journaling enabled but the "
+              << startupWarningsLog;
+        log() << "**          writeConcernMajorityJournalDefault option to the replica set config "
+              << startupWarningsLog;
+        log() << "**          is set to true. The writeConcernMajorityJournalDefault "
+              << startupWarningsLog;
+        log() << "**          option to the replica set config must be set to false "
+              << startupWarningsLog;
+        log() << "**          or w:majority write concerns will never complete."
+              << startupWarningsLog;
+        log() << startupWarningsLog;
+    }
 
     log() << "New replica set config in use: " << _rsConfig.toBSON() << rsLog;
     _selfIndex = myIndex;