[GitHub] kl0u opened a new pull request #6466: [FLINK-10005][DataStream API] StreamingFileSink: sets initialPartCounter=maxUsed in new Buckets

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kl0u opened a new pull request #6466: [FLINK-10005][DataStream API] StreamingFileSink: sets initialPartCounter=maxUsed in new Buckets
URL: https://github.com/apache/flink/pull/6466
 
 
   ## What is the purpose of the change
   
   In the `StreamingFileSink` whenever a new bucket is created, we provide it with the initial part counter to use for its part files. In addition, when a bucket has no in-progress or pending files, it is removed from the state. 
   
   This behavior was leading to the problem:
   * bucket X starts with partCounter = 0
   * creates a new part file, i.e. partCounter = 1
   * everything gets committed and bucket X is empty so it gets removed from the state.
   * a new element comes in, and the bucket starts again with 0.
   
   This was solved for when recovering from a failure, but not if this deletion and creation of a bucket happens in normal execution. This PR solves this issue.
   
   ## Brief change log
   
   We change the `initialPartCounter` argument passed when creating a new bucket, to be the `max` across all local buckets. This allows to be sure that we do not ovewrite anything and also we do not need to the `blind searches` for file names in order to determine a valid part counter. The latter would not work in eventually-consistent filesystems.
   
   ## Verifying this change
   
   Updated existing tests to cover this scenario.
   
   ## 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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