hadoop fs-mkdir连接异常失败

Question

我一直试图在伪分布式模式中设置和运行Hadoop。但是当我键入

<configuration>
  <property>
    <name>hadoop.tmp.dir</name>
    <value>/home/grid/tmp</value>
  </property>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://h1:9000</value>
    </property>
</configuration>

mapred-site.xml

<configuration>
    <property>
        <name>mapred.job.tracker</name>
        <value>h1:9001</value>
    </property>

  <property>
    <name>mapred.map.tasks</name>
    <value>20</value>
  </property>
  <property>
    <name>mapred.reduce.tasks</name>
    <value>4</value>
  </property>
  <property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
  </property>
  <property>
    <name>mapreduce.jobtracker.http.address</name>
    <value>h1:50030</value>
  </property>
  <property>
    <name>mapreduce.jobhistory.address</name>
    <value>h1:10020</value>
  </property>
  <property>
    <name>mapreduce.jobhistory.webapp.address</name>
    <value>h1:19888</value>
  </property>

</configuration>

hdfs-site.xml

<configuration>

  <property>
    <name>dfs.http.address</name>
    <value>h1:50070</value>
  </property>
  <property>
    <name>dfs.namenode.rpc-address</name>
    <value>h1:9001</value>
  </property>
  <property>
    <name>dfs.namenode.secondary.http-address</name>
    <value>h1:50090</value>
  </property>
  <property>
    <name>dfs.datanode.data.dir</name>
    <value>/home/grid/data</value>
  </property>
    <property>
        <name>dfs.replication</name>
        <value>2</value>
    </property>
</configuration>

/etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.13 h1
192.168.1.14 h2
192.168.1.15 h3

1702 ResourceManager
1374 DataNode
1802 NodeManager
2331 Jps
1276 NameNode
1558 SecondaryNameNode

[grid@h1 hadoop-2.6.0]$ bin/hadoop fs -mkdir input
15/05/13 16:37:57 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
mkdir: Call From h1/192.168.1.13 to h1:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused

2015-05-12 11:26:20,329 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = h1/192.168.1.13
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 2.6.0

2015-05-08 16:06:32,561 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = h1/192.168.1.13
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 2.6.0

[grid@h1 ~]$ netstat -tnl |grep 9000
[grid@h1 ~]$ netstat -tnl |grep 9001
tcp        0      0 192.168.1.13:9001           0.0.0.0:*                   LISTEN     

Answer 1

请启动dfs和纱线。

[Hadoop@Hadooplab sbin]$./start-dfs.sh

[Hadoop@Hadooplab sbin]$./start-yarn.sh

现在尝试使用“bin/hadoop fs-mkdir输入”

当您在VM中安装hadoop然后关闭它时，通常会出现问题。当您关闭VM时，dfs和yarn也会停止。所以每次重启VM时都需要启动dfs和yarn。