klion26 opened a new pull request #11722: [FLINK-5763][state backends] Make 
savepoints self-contained and relocatable
URL: https://github.com/apache/flink/pull/11722
 
 
   ## What is the purpose of the change
   
   This pr wants to make savepoint self-contained and relocatable.
   
   ## Brief change log
   
     - Snapshot relative state handle to the file and write the base path in 
metadata of savepoint
     - Add option to change the base path for all the savepoint operations.
   
   
   ## Verifying this change
   
   - SavepointITCase
   
   ## 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/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no )
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes)
     - If yes, how is the feature documented? (docs)
   

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