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[Source] Master the Java API interface access of HDFS

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Posted on 7/5/2019 1:35:05 PM | | |
The main purpose of HDFS design is to store massive amounts of data, that is, it can store a large number of files (terabytes of files). HDFS provides two access interfaces: the shell interface and the Java API interface, which operate the files in HDFS, and which DataNode each block is placed on, which is transparent to the developer.

1. Get the file system

2. Create a file directory


3. Delete the file or file directory


4. Obtain the file in the directory according to the filter


5. Upload the file to HDFS

6. Download the file from HDFS


7. Obtain the node information of the HDFS cluster


8. Find the location of a file in the HDFS cluster


9. Rename the file


10. Determine whether the catalog exists


(End)





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