ferenc-csaky opened a new pull request, #23062:
URL: https://github.com/apache/flink/pull/23062

   ## What is the purpose of the change
   
   Introduces a file catalog store implementation that supports external file 
systems.
   
   ## Brief change log
   
   - Use `org.apache.flink.core.fs.Path` instead of standard Java local FS file 
utils.
   - Use `FSDataOutputStream` and `FSDataInputStream` to read/write the catalog 
store file.
   - Validate the given catalog store file exists in `FileCatalogStore#open()`, 
as automatic directory creation may fail on external file systems. (Permission 
problems or unsupported API)
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as:
   - `FileCatalogStoreTest`
   - `FileCatalogStoreFactoryTest`
   
   Will add a test case with an external FS.
   
   ## 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: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
   


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