[Hadoop] HDFS Writing

The Writing operation in HDFS?

• Writing is another important operation in HDFS.
• To write in HDFS, at first, the client sends requests for metadata to the NameNode. When the NameNode responds, then it sends a response with the number of blocks, thier location, and some other details.
• After getting this information, the client splits the data into different blocks, and then start sending to the DataNodes.
• The client sends the data block with other DataNode details. When one block is received, DataNodes create the replica and store them into another DataNodes.

• This is the pictorial representation of the Data Writing procedure.