Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/14961
Upgrading Netty version to branch 1.6 may cause API version incompatible
issue for yarn shuffle service, please see
[SPARK-16018](https://issues.apache.org/jira/browse/SPARK-16018) and
[SPARK-15178](https://issues.apache.org/jira/browse/SPARK-15178). We also need
to shade netty if we want to backport to 1.6.
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