Github user wangyum commented on a diff in the pull request:
https://github.com/apache/spark/pull/22372#discussion_r216208793
--- Diff: pom.xml ---
@@ -2694,6 +2694,8 @@
<hadoop.version>3.1.0</hadoop.version>
<curator.version>2.12.0</curator.version>
<zookeeper.version>3.4.9</zookeeper.version>
+ <fasterxml.jackson.version>2.7.8</fasterxml.jackson.version>
+
<fasterxml.jackson.databind.version>2.7.8</fasterxml.jackson.databind.version>
--- End diff --
```sh
build/sbt dependency-tree -Phadoop-3.1
```

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