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https://issues.apache.org/jira/browse/HDFS-13936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16628004#comment-16628004
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Ewan Higgs commented on HDFS-13936:
-----------------------------------
01
* If the parts in the FileSystemMultipartUploader are empty then only touch the
file (create+close).
* Add a contract test to make sure this works across MPU implementations.
> multipart upload to HDFS to support 0 byte upload
> -------------------------------------------------
>
> Key: HDFS-13936
> URL: https://issues.apache.org/jira/browse/HDFS-13936
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: fs, hdfs
> Affects Versions: 3.2.0
> Reporter: Steve Loughran
> Assignee: Ewan Higgs
> Priority: Major
> Attachments: HDFS-13936.01.patch
>
>
> MPUs to HDFS fail as you can't concat an empty block.
> Whatever uploads to HDFS needs to recognise that specific case "0-byte file"
> and rather than try and concat things, just create a 0-byte file there.
> Without this, you can't use MPU as a replacement for distcp or alternative
> commit protocols.
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