HDFS connection failed:
Common causes of errors may be:
1. Hadoop is not started (not all started). Hadoop is normally started including the following services. If the services are not all started, you can check the log
![](https://xuebuyuan.icrazy.men/https://img-blog.csdn.net/20140224201554703?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQveWVsbG93aGRo/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
![](https://programmerah.com/wp-content/uploads/2020/10/20190617150818210.jpg)
2. Installation of pseudo-distributed mode; localhost or 127.0.0.1 is used in the configuration file; at this time, the real ID should be changed, including core-site.xml, Mapred-site.xml, Slaves,
Masters, after modifying IP, the dataNode may fail to start,
Set DFS. Data.dir in the HDFs-site.xml profile:
& lt; property>
& lt; name> dfs.data.dir< /name>
& lt; value> /data/hdfs/data< /value>
& lt; /property>
Delete all files in the folder in Hadoop and restart Hadoop
Common causes of errors may be:
1. Hadoop is not started (not all started). Hadoop is normally started including the following services. If the services are not all started, you can check the log
![](https://programmerah.com/wp-content/uploads/2020/10/20190617150818210.jpg)
2. Installation of pseudo-distributed mode; localhost or 127.0.0.1 is used in the configuration file; at this time, the real ID should be changed, including core-site.xml, Mapred-site.xml, Slaves,
Masters, after modifying IP, the dataNode may fail to start,
Set DFS. Data.dir in the HDFs-site.xml profile:
& lt; property>
& lt; name> dfs.data.dir< /name>
& lt; value> /data/hdfs/data< /value>
& lt; /property>
Delete all files in the folder in Hadoop and restart Hadoop
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