Steve Loughran 6a3433bffd
HADOOP-16357. TeraSort Job failing on S3 DirectoryStagingCommitter: destination path exists.
Contributed by Steve Loughran.

This patch

* changes the default for the staging committer to append, as we get for the classic FileOutputFormat committer
* adds a check for the dest path being a file not a dir
* adds tests for this
* Changes AbstractCommitTerasortIT. to not use the simple parser, so fails if the file is present.

Change-Id: Id53742958ed1cf321ff96c9063505d64f3254f53
2019-07-11 18:15:34 +01:00
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