[GitHub] kl0u opened a new pull request #7047: [FLINK-10522] Check if RecoverableWriter supportsResume() and act accordingly.

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

kl0u opened a new pull request #7047: [FLINK-10522] Check if RecoverableWriter supportsResume() and act accordingly.
URL: https://github.com/apache/flink/pull/7047
 
 
   ## What is the purpose of the change
   
   So far, the `StreamingFileSink` was always resuming when recovering from a checkpoint. This is a valid approach, as all implementation of a `RecoverableWriter` support resume.
   
   Given that the `RecoverableWriter` also allows to query if the writer supports resuming or not, and that in the future we may introduce writers that do not support resume (e.g. Hadoop versions that do not allow `truncate`) this PR leverages this method and depending on the outcome either resumes writing to the pre-failure in-progress file, or it simply commits the file and opens a new in-progress one.
   
   
   ## Verifying this change
   
   Added unit tests under the `BucketTest` class. 
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (**yes** / no / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
   

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