Example Analysis of HDFS File Writing process

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Figure understanding:

Explain the process of HDFS writing in detail:

The 1.Client client issues a request for open to the Distributed FileSystem distributed file system

2.Distributed FileSystem will send a request for information about the location of the block to NN.

3.Distributed FileSystem gets the location information of the block (what NN returns to Distributed FileSystem is actually the FileSystem object, which includes the location information of the block)

4. Then use outputstream stream to DN to achieve the write operation.

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