Alex Van Boxel commented on BEAM-2639:

Just an update. We will require this feature in the coming months in our 
production pipelines, so this is still scheduled. Initial experiments are 
already done.

> Unbounded Source for MongoDB
> ----------------------------
>                 Key: BEAM-2639
>                 URL: https://issues.apache.org/jira/browse/BEAM-2639
>             Project: Beam
>          Issue Type: Bug
>          Components: io-java-mongodb
>    Affects Versions: 2.0.0
>            Reporter: nevi_me
>            Assignee: Jean-Baptiste Onofré
>            Priority: Minor
> The current MongoDB source is bounded, which means that we can't build 
> streaming pipelines directly from MongoDB.
> MongoDB publishes changes in each collection through the oplog. Would it be 
> possible to create a connector that reads the oplog to create an unbounded 
> source?
> As an oplog is only available through replication, this creates that 
> dependency. We would need to also consider whether a polling method (using 
> the ObjectId) could be an appropriate fallback.
> Thanks

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