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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