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https://issues.apache.org/jira/browse/HADOOP-13293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16699071#comment-16699071
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Steve Loughran commented on HADOOP-13293:
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Looking @ the logs this would significantly speed up some operations, as well
as fix reported problems with some third party S3 implementations which can't
handle a content length of 0-0
> 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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