Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/10780#issuecomment-172143421
Updated patch which has shading of `com.fasterxml.jackson` ->
`org.spark-project.com.fasterxml.jackson`
There's a test for this working; it uses the ant plugin to probe the JAR
for .class files. It works, and I've verified that it stops working if you
don't have the classes in. This validation runs in the `verify` phase,
immediately before the `install` action: you can't install this package without
the shading working. Accordingly: its a regression test on the feature.
This test does not (obviously) verify that this fixes the conflict between
YARN NM and Shuffle. This is going to need external tests
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