An example Analysis of the Reading process of HDFS File

This article mainly introduces the example analysis of the HDFS file reading process, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

To understand in terms of diagrams:

Explain the process of HDFS reading 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 inputstream to stream to DN to realize the read operation.

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