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https://issues.apache.org/jira/browse/SPARK-20448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16178236#comment-16178236
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Steve Loughran commented on SPARK-20448:
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thanks!

> Document how FileInputDStream works with object storage
> -------------------------------------------------------
>
>                 Key: SPARK-20448
>                 URL: https://issues.apache.org/jira/browse/SPARK-20448
>             Project: Spark
>          Issue Type: Documentation
>          Components: Documentation
>    Affects Versions: 2.1.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 2.3.0
>
>
> Object stores work differently from filesystems: intermediate writes not 
> visible, renames are really O(data) copies, not O(1) transactions.
> This makes working with them as DStreams fundamentally different: you can 
> write straight into the destination.
> 1. Document how FileinputDStreams scan directories for changes
> 2. Document how object stores behave differently, and the implications
> for users.



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