Steve Loughran updated HADOOP-13853:
    Parent: HADOOP-15220  (was: HADOOP-14831)

> S3ADataBlocks.DiskBlock to lazy create dest file for faster 0-byte puts
> -----------------------------------------------------------------------
>                 Key: HADOOP-13853
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13853
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Priority: Minor
> Looking at traces of work, there's invariably a PUT of a _SUCCESS at the end, 
> which, with disk output, adds the overhead of creating, writing to and then 
> reading a 0 byte file.
> With a lazy create, the creation could be postponed until the first write, 
> with special handling in the {{startUpload()}} operation to return a null 
> stream, rather than reopen the file. Saves on some disk IO: create, read, 
> delete

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