安装Hadoop环境遇到Failed to connect to server

在搭建Hadoop环境时，jps只有2344 Jps，32744 JobHistoryServer两个进程
hdfs dfsadmin -report查看


17/03/31 23:26:21 WARN ipc.Client: Failed to connect to server: Master/123.206.16.62:9000: try once and fail.
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:744)
        at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495)
        at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:681)
        at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:777)
        at org.apache.hadoop.ipc.Client$Connection.access$3500(Client.java:409)
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:1542)
        at org.apache.hadoop.ipc.Client.call(Client.java:1373)
        at org.apache.hadoop.ipc.Client.call(Client.java:1337)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
        at com.sun.proxy.$Proxy10.getFsStats(Unknown Source)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getStats(ClientNamenodeProtocolTranslatorPB.java:626)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:398)
        at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)
        at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)
        at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:335)
        at com.sun.proxy.$Proxy11.getStats(Unknown Source)
        at org.apache.hadoop.hdfs.DFSClient.getStateByIndex(DFSClient.java:2073)
        at org.apache.hadoop.hdfs.DFSClient.getDiskStatus(DFSClient.java:2082)
        at org.apache.hadoop.hdfs.DistributedFileSystem.getStatus(DistributedFileSystem.java:1224)
        at org.apache.hadoop.fs.FileSystem.getStatus(FileSystem.java:2350)
        at org.apache.hadoop.hdfs.tools.DFSAdmin.report(DFSAdmin.java:476)
        at org.apache.hadoop.hdfs.tools.DFSAdmin.run(DFSAdmin.java:1908)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
        at org.apache.hadoop.hdfs.tools.DFSAdmin.main(DFSAdmin.java:2099)
report: Call From Master/123.206.16.62 to Master:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused






配置文件







请问各位大神问题出在什么地方，应该怎么解决？

首先使用
[mw_shl_code=bash,true]telnet master 9000
[/mw_shl_code]看是否通
参考
大数据集群【hadoop、hbase、spark、hive，zookeeper、storm等】故障排除之端口详解
http://www.aboutyun.com/forum.php?mod=viewthread&tid=20880


另外
dfs.replication设置为3

nextuser 发表于 2017-4-1 15:06
首先使用
看是否通
参考

[root@Master hadoop]# telnet master 9000
Trying 123.206.16.62...
telnet: connect to address 123.206.16.62: Connection refused


请问我的datanoe有两台，dfs.replication也设置为3吗？

检查防火墙和selinux，关闭了，检查hosts文件解析

levycui 发表于 2017-4-1 17:17
检查防火墙和selinux，关闭了，检查hosts文件解析

[hadoop@Master ~]$ sudo service iptables status
iptables: Firewall is not running.
[hadoop@Master ~]$ /usr/sbin/sestatus -v
SELinux status:                 disabled
[hadoop@Master ~]$ cat /etc/hosts
127.0.0.1  localhost  localhost.localdomain        localhost4.localdomain4

123.206.16.62        Master
123.206.66.192        Slave1
118.89.221.12        Slave2

[hadoop@Master ~]$


您好 防火墙和SELinux都处于关闭状态，请问Hosts文件这样解析对吗？

[hadoop@Master ~]$ hdfs dfsadmin -report      
report: Call From Master/123.206.16.62 to Master:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
[hadoop@Master ~]$

AceCC 发表于 2017-4-2 16:43
[hadoop@Master ~]$ hdfs dfsadmin -report      
report: Call From Master/123.206.16.62 to Master:90 ...

楼主需要完成下面事情：
123.206.16.62        Master
123.206.66.192        Slave1
118.89.221.12        Slave2

确保他们之间相互ping通【为何他们网段不同】

然后端口能ping通
[mw_shl_code=bash,true] telnet master 9000[/mw_shl_code]
楼主给出的显然端口不通的。
可以看看9000端口被谁暂用了。
netstat -anp|grep 9000
更多可以百度看看端口不通的原因

nextuser 发表于 2017-4-2 18:43
楼主需要完成下面事情：
123.206.16.62        Master
123.206.66.192        Slave1

您好，各主机能够ping通，但是端口之间却不通，防火墙也都是关闭的，我把账号和密码给您，您方便给看下具体原因吗？