Istvan Fajth created HDDS-2114:
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Summary: Rename does not preserve non-explicitly created interim
directories
Key: HDDS-2114
URL: https://issues.apache.org/jira/browse/HDDS-2114
Project: Hadoop Distributed Data Store
Issue Type: Bug
Reporter: Istvan Fajth
Attachments: demonstrative_test.patch
I am attaching a patch that adds a test that demonstrates the problem.
The scenario is coming from the way how Hive implements acid transactions with
the ORC table format, but the test is redacted to the simplest possible code
that reproduces the issue.
The scenario:
* Given a 3 level directory structure, where the top level directory was
explicitly created, and the interim directory is implicitly created (for
example either by creating a file with create("/top/interim/file") or by
creating a directory with mkdirs("top/interim/dir"))
* When the leaf is moved out from the implicitly created directory making this
directory an empty directory
* Then a FileNotFoundException is thrown when getFileStatus or listStatus is
called on the interim directory.
The expected behaviour:
after the directory is becoming empty, the directory should still be part of
the file system, moreover an empty FileStatus array should be returned when
listStatus is called on it, and also a valid FileStatus object should be
returned when getFileStatus is called on it.
As this issue is present with Hive, and as this is how a FileSystem is expected
to work this seems to be an at least critical issue as I see, please feel free
to change the priority if needed.
Also please note that, if the interim directory is explicitly created with
mkdirs("top/interim") before creating the leaf, then the issue does not appear.
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