bkonold opened a new pull request #1330: SAMZA-2353: Support standby containers 
with transactional state
URL: https://github.com/apache/samza/pull/1330
 
 
   **Symptom:** Job has transactional state (checkpoint & restore) and standby 
enabled. When an active container fails over, it bootstraps state from 
changelog as it is unable to re-use state written by the standby container.
    
   **Cause:** The failed-over active container expects store checkpoint 
directories such that the last consumed offset for the store is <= the latest 
checkpoint offset for that store SSP.
    
   **Changes:** Described in detail here. 
https://docs.google.com/document/d/1FcWWcig_rc86bTt2G9ZJxuIRQ6dUu-hVUCXVhyKJpOU/edit?usp=sharing
    
   **Tests:** WIP
   
   **API Changes:** `TaskSideInputStorageManager` is extracted as an interface, 
adding two methods:
   ```
   checkpoint(CheckpointId checkpointId)
   removeOldCheckpoints(CheckpointId checkpointId)
   ```
   with two implementing classes: `TransactionalTaskSideInputStorageManager` 
and `NonTransactionalTaskSideInputStorageManager`
    
   **Upgrade Instructions:** None
    
   **Usage Instructions:** New behavior is enabled with the config 
`task.transactional.state.checkpoint.enabled` set to true.

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