text: /**
   * Test that a rollback of a non-rollbackable command causes a message to be logged
   *
   * If all data-bearing nodes in a replica set are using an ephemeral storage engine, the set will
   * not be able to survive a scenario where all data-bearing nodes are down simultaneously. In such a
   * scenario, none of the members will have any data, and upon restart will each look for a member to
   * initial sync from, so no primary will be elected. This test induces such a scenario, so cannot be
   * run on ephemeral storage engines.
   * @tags: [requires_persistence]
  */
  
  // Sets up a replica set and grabs things for later.
  var name = "rollback_cmd_unrollbackable";
  var replTest = new ReplSetTest({name: name, nodes: 3});
  var nodes = replTest.nodeList();
  var conns = replTest.startSet();
  replTest.initiate({
      "_id": name,
      "members": [
          {"_id": 0, "host": nodes[0], priority: 3},
          {"_id": 1, "host": nodes[1]},
          {"_id": 2, "host": nodes[2], arbiterOnly: true}
      ]
  });
  var a_conn = conns[0];
  var b_conn = conns[1];
  var AID = replTest.getNodeId(a_conn);
  var BID = replTest.getNodeId(b_conn);
  
  // Gets master and do an initial write.
  replTest.waitForState(replTest.nodes[0], ReplSetTest.State.PRIMARY);
  var master = replTest.getPrimary();
  assert(master === conns[0], "conns[0] assumed to be master");
  assert(a_conn.host === master.host, "a_conn assumed to be master");
  var options = {writeConcern: {w: 2, wtimeout: ReplSetTest.kDefaultTimeoutMS}, upsert: true};
  assert.writeOK(a_conn.getDB(name).foo.insert({x: 1}, options));
  
  // Shuts down the master.
  replTest.stop(AID);
  
  // Inserts a fake oplog entry with a non-rollbackworthy command.
  master = replTest.getPrimary();
  assert(b_conn.host === master.host, "b_conn assumed to be master");
  options = {
      writeConcern: {w: 1, wtimeout: ReplSetTest.kDefaultTimeoutMS},
      upsert: true
  };
  // Inserts another oplog entry to set minValid ahead.
  assert.writeOK(b_conn.getDB(name).foo.insert({x: 123}));
  var oplog_entry = b_conn.getDB("local").oplog.rs.find().sort({$natural: -1})[0];
  oplog_entry["ts"] = Timestamp(oplog_entry["ts"].t, oplog_entry["ts"].i + 1);
  oplog_entry["op"] = "c";
  oplog_entry["o"] = {
      "emptycapped": 1
  };
  assert.writeOK(b_conn.getDB("local").oplog.rs.insert(oplog_entry));
  
  // Shuts down B and brings back the original master.
  replTest.stop(BID);
  replTest.restart(AID);
  master = replTest.getPrimary();
  assert(a_conn.host === master.host, "a_conn assumed to be master");
  
  // Does a write so that B will have to roll back.
  options = {
      writeConcern: {w: 1, wtimeout: ReplSetTest.kDefaultTimeoutMS},
      upsert: true
  };
  assert.writeOK(a_conn.getDB(name).foo.insert({x: 2}, options));
  
  // Restarts B, which should attempt to rollback but then fassert.
  clearRawMongoProgramOutput();
  replTest.restart(BID);
  var msg = RegExp("Can't roll back this command yet: ");
  assert.soon(function() {
      return rawMongoProgramOutput().match(msg);
  }, "Did not see a log entry about skipping the nonrollbackable command during rollback");
  
  replTest.stop(BID, undefined, {allowedExitCode: MongoRunner.EXIT_ABRUPT});
  replTest.stopSet();
  