Uniquely-named directory was always created for hdfs artifact repo (#…

…5210)

* Fix command in xgboost example readme (#5202)

Signed-off-by: Junwen Yao <jwyiao@gmail.com>
Signed-off-by: Dima Claudiu <claudiu.dima@soleadify.com>

* formatting

Signed-off-by: harupy <17039389+harupy@users.noreply.github.com>

Co-authored-by: Junwen Yao <jwyiao@gmail.com>
Co-authored-by: harupy <17039389+harupy@users.noreply.github.com>

mlflow/store/artifact/hdfs_artifact_repo.py

@@ -125,7 +125,10 @@ def download_artifacts(self, artifact_path, dst_path=None):
         """
 
         hdfs_base_path = _resolve_base_path(self.path, artifact_path)
-        local_dir = _tmp_dir(dst_path)
+        if dst_path and os.path.exists(dst_path):
+            local_dir = os.path.abspath(dst_path)
+        else:
+            local_dir = _tmp_dir(dst_path)
 
         with hdfs_system(scheme=self.scheme, host=self.host, port=self.port) as hdfs: