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https://issues.apache.org/jira/browse/HDFS-3755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428264#comment-13428264
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Aaron T. Myers commented on HDFS-3755:
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Note that this change doesn't introduce any new semantics per se. This patch
just changes the user-visible behavior back to what it was in branch-1. It's
fixing a bug that was inadvertently introduced in branch-2.
Given that, I don't think that we need to mark this change as being
incompatible, but I don't feel super strongly about this.
> Creating an already-open-for-write file with overwrite=true fails
> -----------------------------------------------------------------
>
> Key: HDFS-3755
> URL: https://issues.apache.org/jira/browse/HDFS-3755
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 2.0.0-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-3755.txt
>
>
> If a file is already open for write by one client, and another client calls
> {{fs.create()}} with {{overwrite=true}}, the file should be deleted and the
> new file successfully created. Instead, it is currently throwing
> AlreadyBeingCreatedException.
> This is a regression since branch-1.
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