Steve Loughran updated HADOOP-13293:
    Parent: HADOOP-15220  (was: HADOOP-14831)

> add a special 0 byte input stream for empty blobs
> -------------------------------------------------
>                 Key: HADOOP-13293
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13293
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Priority: Minor
> S3a (and the other object stores) have a lot of IO going on, even for 0 byte 
> files. They don't need to: that's a special case which can be handled 
> locally. A special ZeroByteInputStream class could handle this for all the 
> object stores.
> This isn't much of an optimization: code shouldn't normally need to go 
> through 0 byte files, but we see evidence it does sometimes happen.

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