(function() { const rst = new ReplSetTest({nodes: 1}); rst.startSet(); rst.initiate(); const session = rst.getPrimary().getDB( "test" ).getMongo().startSession(); const db1 = session.getDatabase( "test1" ); const db2 = session.getDatabase( "test2" ); // Populate two collections in different databases. for (let i = 0; i < 4; i++) { assert .commandWorked(db1.coll.insert({_id: i}, {writeConcern: {w: "majority" }})); assert .commandWorked(db2.coll.insert({_id: i}, {writeConcern: {w: "majority" }})); } // Open a snapshot read cursor on db1.coll. let res = assert .commandWorked(db1.runCommand( {find: "coll" , batchSize: 2, readConcern: {level: "snapshot" }, txnNumber: NumberLong(0)})); // Open a snapshot read cursor on db2.coll. res = assert .commandWorked(db2.runCommand( {find: "coll" , batchSize: 2, readConcern: {level: "snapshot" }, txnNumber: NumberLong(1)})); // db2.coll is not locked, so this drop succeeds, when it should fail. db2.coll.drop(); rst.stopSet(); }());