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Anatomy of a Write Operation
This lesson explains how HDFS handles a write operation.
HDFS write process
HDFS write process can be outlined as follows:
- HDFS client initiates a write request by calling the
create()method of the
Distributed FileSystemobject sends a file creation request to the NameNode.
- The NameNode verifies that the file does not already exist and that the client has permission to create the file. If both these conditions are verified, the NameNode creates a new file record and sends an acknowledgment. 4
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