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This article mainly introduces the hadoop reformat HDFS example analysis, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

The method to reformat the hdfs system:

1. Open hdfs-site.xml

We open the hdfs-site.xml of Hadoop, and the basic configuration is as follows:

Dfs.name.dir / usr/local/hadoop/hdfs/name dfs.data.dir / usr/local/hadoop/hdsf/data

Delete the directory specified by dfs.name.dir, delete the directory specified by dfs.data.dir, and we need to delete the storage information path configured in hdfs-site.xml.

2. Delete the relevant directories specified in the core-site.xml configuration file

Hadoop.tmp.dir / usr/local/hadoop/hadooptmp

Delete the directory specified by hadoop.tmp.dir, that is, delete the temporary file path of Hadoop.

3. Re-execute the command: hadoop namenode-format

Formatted.

This way of formatting HDFS requires emptying all the data in the original HDFS, and then formatting and installing a new HDFS.

Note: this format requires emptying all the data in the HDFS. Later, we will explore ways to reformat the data without deleting it.

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