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https://issues.apache.org/jira/browse/HADOOP-13853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-13853.
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Resolution: Won't Fix
for s3 io, the local FS isn't normally the bottleneck
> 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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