1.

How does CopyFromLocal command for Hadoop DFS work?

Answer»
  • The CLIENT connects to the name node to register a new file in HDFS.
  • The name node creates some metadata about the file (either USING the default BLOCK size, or a configured value for the file)
  • For each block of DATA to be written, the client queries the name node for a block ID and list of destination datanodes to write the data to. Data is then written to each of the datanodes.


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