我使用hortonworks沙盒hdp2.4在桥模式。在kafka中运行./bin/kafka-server-start.sh config/server.properties以启动kafka代理时，出现以下错误：

[2016-06-23 06:45:37,779] ERROR Exception emitting metrics (org.apache.hadoop.metrics2.sink.kafka.KafkaTimelineMetricsReporter)        
org.apache.hadoop.metrics2.sink.timeline.UnableToConnectException: java.net.ConnectException: Connection refused                       
        at org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.emitMetrics(AbstractTimelineMetricsSink.java:87)       
        at org.apache.hadoop.metrics2.sink.kafka.KafkaTimelineMetricsReporter.access$200(KafkaTimelineMetricsReporter.java:58)         
        at org.apache.hadoop.metrics2.sink.kafka.KafkaTimelineMetricsReporter$TimelineScheduledReporter.report(KafkaTimelineMetricsRepo
rter.java:253)                                                                                    
Caused by: java.net.ConnectException: Connection refused                                                                               
        at java.net.PlainSocketImpl.socketConnect(Native Method)                                                                       
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)                                                
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)                                         
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)                                                  
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)                                                                  
        at java.net.Socket.connect(Socket.java:579)                                                                                    
        at sun.net.NetworkClient.doConnect(NetworkClient.java:175)                                                                     
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)                                                                 
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)                                                                 
        at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)                                                                     
        at sun.net.www.http.HttpClient.New(HttpClient.java:308)                                                                        
        at sun.net.www.http.HttpClient.New(HttpClient.java:326)                                                                        
        at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:998)                                    
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:934)                                        
        at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:852)                                             
        at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1093)                                    
        at org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.emitMetrics(AbstractTimelineMetricsSink.java:73)       
        ... 11 more                                                               Caused by: java.net.ConnectException: Connection refused                                                                               
        at java.net.PlainSocketImpl.socketConnect(Native Method)                                                                       
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)                                                
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)                                         
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)                                                  
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)                                                                  
        at java.net.Socket.connect(Socket.java:579)                                                                                    
        at sun.net.NetworkClient.doConnect(NetworkClient.java:175)                                                                     
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)                                                                 
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)                                                                 
        at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)                                                                     
        at sun.net.www.http.HttpClient.New(HttpClient.java:308)                                                                        
        at sun.net.www.http.HttpClient.New(HttpClient.java:326)                                                                        
        at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:998)                                    
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:934)                                        
        at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:852)                                             
        at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1093)                                    
        at org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.emitMetrics(AbstractTimelineMetricsSink.java:73)       
        ... 11 more