Can I Modify the DataNode Data Storage Directory?

Question

• In DataNode, the storage directory of data blocks is specified by dfs.datanode.data.dir. Can I modify the parameter to change the data storage directory?
• Can I copy files from the data storage directory?

Answer

During the system installation, you need to configure the dfs.datanode.data.dir parameter to specify one or multiple root directories.

• Exercise caution when modifying dfs.datanode.data.dir since you may add a new root directory.

• Do not delete the original storage directory. Otherwise, data blocks will lose and files cannot be read or write.
• Do not delete or modify data blocks in the storage directory. Otherwise, data blocks may be lost.

NameNode and JournalNode have similar configuration items. Do not delete the original storage directory or delete or modify data blocks in the storage directory.

• dfs.namenode.edits.dir
• dfs.namenode.name.dir
• dfs.journalnode.edits.dir