steveloughran commented on pull request #2149:
URL: https://github.com/apache/hadoop/pull/2149#issuecomment-663587120
see #2170 for the <= 3.2 subset of this patch, needed to not mistake paths
with dir markers as empty.
As well as not deleting markers on file creation, I'm going to add the
option of not doing any re-creation of markers when files are deleted.
This reduces IO on file deletion at the cost of a common assumption: "after
you delete all files in a directory -the directory still exists".
I don't know what that's going to break, so it is going to be explicitly
optional, with the recovery policy to be true/false/authoritative
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