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Can I Modify the DataNode Data Storage Directory?

Updated on 2024-12-11 GMT+08:00

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.
NOTE:

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
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