Xeli opened a new pull request #9388: [FLINK-13230] [pubsub] Add retry 
mechanism to acknowledging pubsub me…
URL: https://github.com/apache/flink/pull/9388
 
 
   ## What is the purpose of the change
   
   Follow up on PubSub connector PR. This adds a retry mechanism to 
acknowledging pubsub messages. Google's PubSub is unstable enough for this to 
be a must-have imo.
   
   ## Brief change log
   
   ## Verifying this change
   
   Trivial change.
   
   ## 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, unless we can add this to 1.9. The pubsub connector 
has not yet been released.
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): Yes, but only 
for the pubsub connector, not the flink core code.
     - 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? JavaDocs

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