Hadoop：java.net.ConnectException：连接被拒绝(Hadoop: java.net.ConnectException: Connection refused)

 您好我一直在尝试按照本教程： http ： //www.tutorialspoint.com/apache_flume/fetching_twitter_data.htm很长一段时间，我完全陷入第3步：在HDFS中创建目录。 我已经运行了start-dfs.sh和start-yarn.sh，两者似乎都正常工作，因为我得到了与教程相同的输出，但是当我尝试运行时： 
 
hdfs dfs -mkdir hdfs://localhost:9000/user/Hadoop/twitter_data 
 
 我一直收到同样的错误： 
 
mkdir: Call From trz-VirtualBox/10.0.2.15 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
 
 我无法弄清楚为什么我到处搜索并尝试了一些解决方案，但似乎无法取得进展。 我将列出我认为可能导致此问题的所有文件，但我可能错了：我的core.site.xml是： 
 
<configuration>
<property>  
<name>hadoop.tmp.dir</name>
<value>/Public/hadoop-2.7.1/tmp</value>
<description>A base for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
 
 我的mapred-site.xml是： 
 
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>hdfs://localhost:9001</value>
</property>
</configuration>
 
 我的hdfs.site.xml是： 
 
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.permission</name>
<value>false</value>
</property>
</configuration>
 
 我在虚拟机上运行Ubuntu 14.04.4 LTS。 我的〜/ .bashrc看起来如此： 
 
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-amd64
export HADOOP_HOME=/usr/local/hadoop/bin 
export HADOOP_HOME=/usr/local/hadoop/bin
export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin
#flume
export FLUME_HOME=/usr/local/Flume
export PATH=$PATH:/FLUME_HOME/apache-flume-1.6.0-bin/bin
export CLASSPATH=$CLASSPATH:/FLUME_HOME/apache-flume-1.6.0-bin/lib/*
 
 最后我的/ etc / hosts文件设置如下： 
 
127.0.0.1  localhost
10.0.2.15  trz-VirtualBox
10.0.2.15  hadoopmaster


# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
 
 添加的hadoopmaster我目前没有使用，这是我试图通过尝试不使用本地主机（没有工作）来解决这个问题之一。 trz-VirtualBox最初是127.0.1.1，但我读到你应该使用你的真实IP地址？ 没有工作，所以我不确定。 我发布了所有这些文件，因为我不知道错误在哪里。 我不认为这是一个路径问题（在我完成这一步之前我已经做了很多事情并且能够自己解决它们）所以我没有想法。 我已经在这里工作了几个小时，所以任何帮助都表示赞赏。 谢谢。 

Hello I have been trying to follow this tutorial: http://www.tutorialspoint.com/apache_flume/fetching_twitter_data.htm for a very long time now and I am absolutely stuck at Step 3: Create a Directory in HDFS. I have ran start-dfs.sh and start-yarn.sh and both seem to have worked correctly as I am getting the same output as the tutorial but when I try to run:
 
hdfs dfs -mkdir hdfs://localhost:9000/user/Hadoop/twitter_data 
 
I keep receiving the same error: 
 
mkdir: Call From trz-VirtualBox/10.0.2.15 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
 
I can not figure out why as I have searched everywhere and tried a number of solutions but can't seem to make progress. I am going to list all of the files that I think could cause this but I could be wrong: My core.site.xml is:
 
<configuration>
<property>  
<name>hadoop.tmp.dir</name>
<value>/Public/hadoop-2.7.1/tmp</value>
<description>A base for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
 
My mapred-site.xml is:
 
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>hdfs://localhost:9001</value>
</property>
</configuration>
 
My hdfs.site.xml is:
 
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.permission</name>
<value>false</value>
</property>
</configuration>
 
I am running Ubuntu 14.04.4 LTS on virtual box. My ~/.bashrc looks as so:
 
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-amd64
export HADOOP_HOME=/usr/local/hadoop/bin 
export HADOOP_HOME=/usr/local/hadoop/bin
export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin
#flume
export FLUME_HOME=/usr/local/Flume
export PATH=$PATH:/FLUME_HOME/apache-flume-1.6.0-bin/bin
export CLASSPATH=$CLASSPATH:/FLUME_HOME/apache-flume-1.6.0-bin/lib/*
 
And finally my /etc/hosts file is set up as so:
 
127.0.0.1  localhost
10.0.2.15  trz-VirtualBox
10.0.2.15  hadoopmaster


# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
 
The added hadoopmaster I am currently not using, that was one of my attempts to fix this by trying not to use local host (didn't work). trz-VirtualBox was originally 127.0.1.1 but I read that you should use your real IP address? Neither worked so I am not sure. I posted all of these files because I do not know where the error is. I do not think it is a path issue (I had a lot before I got to this step and was able to resolve them myself) so I am out of ideas. I've been at this for a number of hours now so any help is appreciated. Thank you. 

原文：https://stackoverflow.com/questions/37637941