Hadoop-- localhost 9000 connection refused

hadoop localhost 9000 connection refused:

telnet localhost 9000

netstat -lpten | grep 9000

return something:

Finally the reason:

core-site.xml:

<configuration>

<property>

<name>hadoop.tmp.dir</name>

<value>/usr/local/bin/hadoop-2.7.1/tmp</value>

</property>

</configuration>

1. Lack of closed </configuration> tap.

2. the tmp directory didn’t exist

Summary:

1. Check network.

2. Check hadoop configuration (hadoop-env.xml/core-site.xml/hdfs-site.xml/mapred-site.xml.tmplate)

3. Always close hadoop services, or will aways get swap file.