on a secondary: sessionOptions = {causalConsistency: false } sess = db.getMongo().startSession(sessionOptions) sess.startTransaction() db.serverStatus({ repl: 0, metrics: 0, locks: 0, wiredTiger: 0 }) db.abc.insert({_id:213}) sess.getDatabase( "test" ).abc.insert({_id: "insert-4" }) // this had a "TransientTransactionError" db.serverStatus({ repl: 0, metrics: 0, locks: 0, wiredTiger: 0 }) sess.getDatabase( "test" ).abc.insert({_id: "insert-4" })  // this had a "TransientTransactionError" db.serverStatus({ repl: 0, metrics: 0, locks: 0, wiredTiger: 0 })