提问参考模版：
- nebula 版本：（1.2.0）
- exchange 版本：1.1.0
- 问题的具体描述
- 导入数据失败，提示链接被拒绝
Exception in thread "main" com.facebook.thrift.transport.TTransportException: java.net.ConnectException: 拒绝连接 (Connection refused)
at com.facebook.thrift.transport.TSocket.open(TSocket.java:204)
at com.vesoft.nebula.client.meta.MetaClientImpl.doConnect(MetaClientImpl.java:90)
at com.vesoft.nebula.AbstractClient.connect(AbstractClient.java:93)
at com.vesoft.nebula.tools.importer.utils.NebulaUtils$.getDataSourceFieldType(NebulaUtils.scala:50)
at com.vesoft.nebula.tools.importer.processor.VerticesProcessor.process(VerticesProcessor.scala:137)
at com.vesoft.nebula.tools.importer.Exchange$$anonfun$main$2.apply(Exchange.scala:174)
at com.vesoft.nebula.tools.importer.Exchange$$anonfun$main$2.apply(Exchange.scala:152)
at scala.collection.immutable.List.foreach(List.scala:392)
at com.vesoft.nebula.tools.importer.Exchange$.main(Exchange.scala:152)
at com.vesoft.nebula.tools.importer.Exchange.main(Exchange.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:923)
at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:164)
at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:187)
at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:89)
at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:998)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1008)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.net.ConnectException: 拒绝连接 (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
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.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.facebook.thrift.transport.TSocket.open(TSocket.java:199)
... 21 more```