Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20230#discussion_r161016953
--- Diff: external/docker/spark-test/base/Dockerfile ---
@@ -15,14 +15,14 @@
# limitations under the License.
#
-FROM ubuntu:precise
+FROM ubuntu:xenial
--- End diff --
Yes. It's required. When we change only jdk7 to jdk8, it fails.
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