[GitHub] [flink] ifndef-SleePy opened a new pull request #8982: [FLINK-13098][datastream] Add a new type UNDEFINED of shuffle mode

[GitBox <gi...@apache.org>]

ifndef-SleePy opened a new pull request #8982: [FLINK-13098][datastream] Add a new type UNDEFINED of shuffle mode
URL: https://github.com/apache/flink/pull/8982
 
 
   ## What is the purpose of the change
   
   * This new shuffle type leaves some space for optimization later. The optimization might be based on resources or some global settings.
   
   ## Brief change log
   
   * The `UNDEFINED` type is the default value of shuffle mode. If there is no specific `PartitionTransformation`, the shuffle mode would be `UNDEFINED`.
   * The `UNDEFINED` shuffle mode can be chained
   
   ## Verifying this change
   
   * Modify the existing case to cover this
   
   ## 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)`: **yes**
     - The serializers: no
     - 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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