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https://issues.apache.org/jira/browse/HDFS-13936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16625847#comment-16625847
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Ewan Higgs commented on HDFS-13936:
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Right, but you could touch a file with no implication of the file being open.
This is used in HDFS for sentinel files (not usually used for files you would
want to concat).
{code:java}
hdfs dfs -touch /empty-file{code}
The best option seems to be to check if there is only a single part and if that
single part is empty, just touch the destination.
> 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
>
> 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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