Question

我正在探索MongoDB中的复制功能，只想澄清一个简单的场景。

我有一个java程序，它在三维实例副本集中不断地在db中插入值，现在如果我关闭主程序，java程序只会抛出一个ioexception并退出。如果选择了新的主要内容，它不应该在选举后继续插入，而我可以看到使用mongo shell选择了新的主要内容并且一切都很好。

May 06, 2016 10:13:26 AM com.mongodb.diagnostics.logging.JULLogger log
INFO: Closed connection [connectionId{localValue:4, serverValue:10}] to akhurraml2:27017 because there was a socket exception raised on another connection from this pool.
May 06, 2016 10:13:26 AM com.mongodb.diagnostics.logging.JULLogger log
INFO: Exception in monitor thread while connecting to server akhurraml2:27017
com.mongodb.MongoSocketOpenException: Exception opening socket
    at com.mongodb.connection.SocketStream.open(SocketStream.java:63)
    at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:114)
    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:142)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:50)
    at com.mongodb.connection.SocketStream.open(SocketStream.java:58)
    ... 3 more

May 06, 2016 10:13:27 AM com.mongodb.diagnostics.logging.JULLogger log
INFO: Closed connection [connectionId{localValue:6}] to akhurraml2:27017 because there was a socket exception raised by this connection.
Exception in thread "main" com.mongodb.MongoSocketOpenException: Exception opening socket
    at com.mongodb.connection.SocketStream.open(SocketStream.java:63)
    at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:114)
    at com.mongodb.connection.UsageTrackingInternalConnection.open(UsageTrackingInternalConnection.java:46)
    at com.mongodb.connection.DefaultConnectionPool$PooledConnection.open(DefaultConnectionPool.java:381)
    at com.mongodb.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:96)
    at com.mongodb.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:82)
    at com.mongodb.connection.DefaultServer.getConnection(DefaultServer.java:72)
    at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.getConnection(ClusterBinding.java:86)
    at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:228)
    at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:221)
    at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:168)
    at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:74)
    at com.mongodb.Mongo.execute(Mongo.java:781)
    at com.mongodb.Mongo$2.execute(Mongo.java:764)
    at com.mongodb.MongoCollectionImpl.executeSingleWriteRequest(MongoCollectionImpl.java:515)
    at com.mongodb.MongoCollectionImpl.insertOne(MongoCollectionImpl.java:306)
    at com.mongodb.MongoCollectionImpl.insertOne(MongoCollectionImpl.java:297)
    at com.nextcontrols.App.main(App.java:33)
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:50)
    at com.mongodb.connection.SocketStream.open(SocketStream.java:58)
    ... 17 more

Answer 1

Arbiters是不保留数据副本的节点。但是，仲裁员在选举中发挥作用，如果当前的主要人员不可用，则选择主要人员。你确定其他两个节点不是仲裁器吗？

Answer 2

添加以下代码可处理异常。它一直等到故障转移发生，然后重试插入：

try{
     collection.insertOne(doc);

     }catch (Exception e){

        System.out.println(e);
   }

MongoDB复制无法正常工作

2 个答案: