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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2727) Add a base class for MessageQueue-with-acknowledgement sources
Date Fri, 02 Oct 2015 08:00:35 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940871#comment-14940871

ASF GitHub Bot commented on FLINK-2727:

Github user StephanEwen commented on the pull request:

    All right, merging this...

> Add a base class for MessageQueue-with-acknowledgement sources
> --------------------------------------------------------------
>                 Key: FLINK-2727
>                 URL: https://issues.apache.org/jira/browse/FLINK-2727
>             Project: Flink
>          Issue Type: New Feature
>          Components: Streaming
>    Affects Versions: 0.10
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
> Several message queues (RabbitMQ, Amazon SQS) have the pattern that you retrieve messages
and acknowledge them back by ID.
> We can create a simple base non-parallel source that provides tooling for:
>   - Collecting the IDs of elements emitted between two checkpoints
>   - Persisting them with the checkpoint, respecting proper serialization
>   - Acknowledging them when a checkpoint is notified of completion.
> This assumes that the Message Queues retain unacknowledged messages and re-emit them
after the acknowledgement period expired. 

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