最初，这个错误消息开始很少出现，但开始更频繁地出现，现在在我运行应用程序时出现了4/5次.
我用Mongo处理会话存储，据我所知，TTL索引用于使会话数据过期.
/home/dan/dev/audio-wave/node_modules/connect-mongo/lib/connect-mongo.js:161
throw new Error('Error setting TTL index on collection : ' + s
^
Error: Error setting TTL index on collection : sessions
at /home/dan/dev/audio-wave/node_modules/connect-mongo/lib/connect-mongo.js:161:23
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1404:28
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1542:30
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:159:22
at commandHandler (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:678:48)
at Db._executeQueryCommand (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1802:12)
at Cursor.nextObject (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:729:13)
at Cursor.toArray (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:158:10)
at Cursor.toArray (/home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/scope.js:10:20)
at /home/dan/dev/audio-wave/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/db.js:1541:65
下面是将其连接在一起的代码
var sessionStore = new MongoStore({ db: 'audio-drop' })
, cookieParser = express.cookieParser('waytoblue')
, SessionSockets = require('session.socket.io')
, sockets = new SessionSockets(io, sessionStore, cookieParser);
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.use(express.favicon());
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.logger('dev'));
app.use(cookieParser);
app.use(express.session({
store: sessionStore
}));
根据Mongo shell的db.version()，我运行的是2.4.9，我使用的是connect-mongo的0.4.0版.
似乎有很多人遇到了这个问题，但他们中的大多数人似乎都解决了凭证问题，我的本地mongo没有身份验证，所以这不可能是问题所在.有什么 idea 吗？