GitHub user vitillo opened a pull request:
https://github.com/apache/spark/pull/17012
[SPARK-19677][SS] Renaming a file atop an existing one should not fail on
HDFS
## What changes were proposed in this pull request?
HDFSBackedStateStoreProvider fails to rename files on HDFS but not on the
local filesystem. According to the [implementation
notes](https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/filesystem/filesystem.html)
of `rename()`, the behavior of the local filesystem and HDFS varies:
> Destination exists and is a file
> Renaming a file atop an existing file is specified as failing, raising an
exception.
> - Local FileSystem : the rename succeeds; the destination file is
replaced by the source file.
> - HDFS : The rename fails, no exception is raised. Instead the method
call simply returns false.
This patch ensures that the destination of `rename()` is overwritten also
in HDFS.
## How was this patch tested?
This patch was tested by running `StateStoreSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vitillo/spark fix_rename
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17012.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17012
----
commit c985f39ad56e39943cff2341036e36919d8d063e
Author: Roberto Agostino Vitillo <[email protected]>
Date: 2017-02-21T07:34:28Z
Renaming a file atop an existing one should not fail on HDFS
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