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From "Thomas Groh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1659) Improve UnboundedSourceShard structure
Date Mon, 03 Apr 2017 18:04:42 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953922#comment-15953922
] 

Thomas Groh commented on BEAM-1659:
-----------------------------------

Yeah, this seems as though it would be suitable.

> Improve UnboundedSourceShard structure
> --------------------------------------
>
>                 Key: BEAM-1659
>                 URL: https://issues.apache.org/jira/browse/BEAM-1659
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-direct
>            Reporter: Thomas Groh
>            Priority: Minor
>              Labels: starter
>
> 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.



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