rkhachatryan opened a new pull request #14024:
URL: https://github.com/apache/flink/pull/14024


   ## What is the purpose of the change
   
   In FLINK-19681, `UnalignedCheckpointITCase` was updated to put more 
backpressure. 
   This revealed a bug introduced in FLINK-19907: resultPartitions can be 
requested before the operator chain is initialized. 
   A proper fix would be to initialize the chain after the outputs but before 
the inputs.
   
   ## Brief change log
   
     - pull the change to `UnalignedCheckpointITCase` from FLINK-19681
     - fix initialization in `StreamTask`
   
   (the two commits can be squashed)
   
   ## Verifying this change
   
   Updated `UnalignedCheckpointITCase`, `OverWindowITCase`
   
   ## 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: yes
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? no
   


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