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The purpose of this article is to share with you what the reading and writing process is like in HDFS. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

File reading process

It also contains the list of block addresses distributed in the Datanode. Of course, the read operation is transparent to the client side, and it feels like a continuous data stream check the files in that path.

Whether it exists and whether or not you have the permission to create the file, of course, the write operation is also transparent to the client side)

3. When the data is written to the file, Client calls the FSDataOutputStream.close () method to close the output stream and the flush cache

Packet of zone

4. Then call the FileSystem.complete () method to tell the Namenode node that the write was successful.

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