无法使用Java驱动程序连接到副本集，使用Node.js驱动程序

以下是我如何使用Node.js连接到副本集：

var MongoClient = require('mongodb').MongoClient;

var url = 'mongodb://ec2-54-237-60-17.compute-1.amazonaws.com:27017/test?readPreference=secondary';

MongoClient.connect(url, function(err, db) {
    console.log(err);

    db.collection('apps').find({}).limit(5).toArray(function(err, docs) {
        console.log(docs);
    });
});

我在控制台中获得了

5

，因此它可以正常工作。 使用Java驱动程序，我要做的是：

import com.mongodb.MongoClient
import com.mongodb.MongoClientURI
import java.util.ArrayList
import com.mongodb.BasicDBObject

object Main extends App {
    val url = "mongodb://ec2-54-237-60-17.compute-1.amazonaws.com:27017/test?readPreference=secondary"
    val client = new MongoClient(new MongoClientURI(url))

    val db = client.getDatabase("database")
    val collection = db.getCollection("apps")
    val results = collection.find().limit(5).into(new ArrayList[org.bson.Document]())
}

我得到以下例外情况：

com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=secondary}. Client view of cluster state is {type=REPLICA_SET, servers=[{address=belinda-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: belinda-mongo.localdomain}, caused by {java.net.UnknownHostException: belinda-mongo.localdomain}}, {address=detroit-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: detroit-mongo.localdomain}, caused by {java.net.UnknownHostException: detroit-mongo.localdomain}}, {address=dione-mongoar.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: dione-mongoar.localdomain}, caused by {java.net.UnknownHostException: dione-mongoar.localdomain}}, {address=pandora-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: pandora-mongo.localdomain}, caused by {java.net.UnknownHostException: pandora-mongo.localdomain}}, {address=riverside-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: riverside-mongo.localdomain}, caused by {java.net.UnknownHostException: riverside-mongo.localdomain}}]
com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=secondary}. Client view of cluster state is {type=REPLICA_SET, servers=[{address=belinda-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: belinda-mongo.localdomain}, caused by {java.net.UnknownHostException: belinda-mongo.localdomain}}, {address=detroit-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: detroit-mongo.localdomain}, caused by {java.net.UnknownHostException: detroit-mongo.localdomain}}, {address=dione-mongoar.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: dione-mongoar.localdomain}, caused by {java.net.UnknownHostException: dione-mongoar.localdomain}}, {address=pandora-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: pandora-mongo.localdomain}, caused by {java.net.UnknownHostException: pandora-mongo.localdomain}}, {address=riverside-mongo.localdomain:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: riverside-mongo.localdomain}, caused by {java.net.UnknownHostException: riverside-mongo.localdomain}}]

我不知道为什么它和一个司机一起工作，而和另一个司机不工作

---

编辑：当我试图仅使用以下url连接到主节点时

mongodb://login:pwd@主机：27019/数据库

工作正常，仅当我添加第二个时才会失败。

您的错误消息指的是端口27017（默认mongo端口），考虑到您的mongo URL包含了replicaSet名称，这似乎有些奇怪，例如：

mongodb://login:pwd@主机：27019，主机：27021/数据库？readPreference=secondary&replicaSet=test

@Ross，不，它也不工作。奇怪。似乎没有主机可以从Java应用程序访问，例如：

riverside mongo.localdomain

-可以ping它们吗？因为它们似乎不在主机字符串中，所以它们设置在哪里？复制集是如何配置的？

riverside mongo.localdomain:27017

是您尝试连接到的replicaSet配置的一部分吗？@Ross我正在尝试连接到我们的一个客户端的MongoDB，所以我不是管理副本集的人。因此，我们的服务器上没有定义主机。但我不明白它如何与JavaScript驱动程序一起工作，而不是与Java驱动程序一起工作。当我只包含主地址时，为什么它与Java驱动程序一起工作。