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How do I wipe out the DFS in Hadoop?
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rm: Remove a file from HDFS, similar to Unix rm command. This command does not delete directories. For recursive delete, use command -rm -r .
Simply follow this path; from the Ambari Dashboard, click HDFS -> Configs -> Advanced -> Advanced core-site. Then set the 'fs. trash. interval' to 0 to disable.
DFS stands for the distributed file system, it is a concept of storing the file in multiple nodes in a distributed manner.
You need to do two things:
Delete the main hadoop storage directory from every node. This directory is defined by the hadoop.tmp.dir property in your hdfs-site.xml.
Reformat the namenode:
hadoop namenode -format
If you only do (2), it will only remove the metadata stored by the namenode, but won't get rid of all the temporary storage and datanode blocks.
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