P3directgood first issueimprovementrunners
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Use the 'OneOf' of "Active Reader" and "Optional<Checkpoint>", to make it obvious how to obtain and use a reader.
Maintain an ordered list of checkpoints that have not been finalized for a shard. Checkpoints that can be resumed from can also be finalized, but otherwise the two are unrelated. This also improves ease of never multi-finalizing a checkpoint. This gets more complicated with retries, but must be considered with the associated work required to make UnboundedReadEvaluatorFactory handle retries properly.
Imported from Jira BEAM-1659. Original Jira may contain additional context. Reported by: tgroh.