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https://issues.apache.org/jira/browse/HDFS-11713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989242#comment-15989242
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Lukas Majercak commented on HDFS-11713:
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None of the findbugs/unit test warnings seem to be related to the change.
> Use MoveFileEx to allow renaming a file when the destination exists
> -------------------------------------------------------------------
>
> Key: HDFS-11713
> URL: https://issues.apache.org/jira/browse/HDFS-11713
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs, native, rolling upgrades
> Affects Versions: 2.7.1, 2.7.3, 3.0.0-alpha1, 3.0.0-alpha2
> Reporter: Lukas Majercak
> Assignee: Lukas Majercak
> Labels: windows
> Fix For: 3.0.0-alpha2
>
> Attachments: HDFS-11713.001.patch
>
>
> The {{NativeIO.c#renameTo0}} currently uses {{MoveFile}} Windows system call,
> which fails when renaming a file to a destination that already exists.
> This makes the {{TestRollingUpgrade.testRollback}} test fail on Windows, as
> during that execution, a DataNode tries to rename block's meta file to a
> destination that exists.
> The proposal is to change to using {{MoveFileEx}} Windows call, and passing
> in {{MOVEFILE_REPLACE_EXISTING}} flag to force the renaming.
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