klion26 opened a new pull request #10305: [FLINK-14892][docs] Add documentation 
for checkpoint directory layout
URL: https://github.com/apache/flink/pull/10305
 
 
   ## What is the purpose of the change
   
   In FLINK-8531, we change the checkpoint directory layout to
   ```
   /user-defined-checkpoint-dir
       |
       + --shared/
       + --taskowned/
       + --chk-00001/
       + --chk-00002/
       + --chk-00003/
       ...
   ```
   But the directory layout did not describe in the doc currently, and some 
users confused about this in the mail-list, this pr wants to add a description 
for the checkpoint directory layout in the documentation.
   
   
   
   ## Verifying this change
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
     - The serializers: (yes / no / don't know)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: ( no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not applicable)
   

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