Chris Nauroth created HADOOP-12550:
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Summary: NativeIO#renameTo on Windows cannot replace an existing
file at the destination.
Key: HADOOP-12550
URL: https://issues.apache.org/jira/browse/HADOOP-12550
Project: Hadoop Common
Issue Type: Bug
Components: native
Environment: Windows
Reporter: Chris Nauroth
Assignee: Chris Nauroth
{{NativeIO#renameTo}} currently has different semantics on Linux vs. Windows if
a file already exists at the destination. On Linux, it's a passthrough to the
[rename|http://linux.die.net/man/2/rename] syscall, which will replace an
existing file at the destination. On Windows, it's a passthrough to
[MoveFile|https://msdn.microsoft.com/en-us/library/windows/desktop/aa365239%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396],
which cannot replace an existing file at the destination and instead triggers
an error. The easiest way to observe this difference is to run the HDFS test
{{TestRollingUpgrade#testRollback}}. This fails on Windows due to a block
recovery after truncate trying to replace a block at an existing destination
path. This issue proposes to use
[MoveFileEx|https://msdn.microsoft.com/en-us/library/windows/desktop/aa365240(v=vs.85).aspx]
on Windows with the {{MOVEFILE_REPLACE_EXISTING}} flag.
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