Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20037
@srowen I think we are resolving a different issue. Your PR
https://github.com/apache/spark/pull/17416 is trying to resolve the issues
raised by `spark-submit et al via --packages`, in which users explicitly
specify the classifier.
However, we still face another scenarios, the package has the external
dependencies. In the dependencies, they have different classifiers. For
example, [zookeeper
3.4.6](https://repo1.maven.org/maven2/org/apache/zookeeper/zookeeper/3.4.6/)
has tests.jar and regular jar. In the current solution, we will download both
to the same file and ivy will return an exception.
```
zookeeper-jar: {artifact=zookeeper, ext=jar, module=zookeeper,
classifier=tests, organisation=org.apache.zookeeper, type=test-jar,
revision=3.4.6}
zookeeper-jar: {artifact=zookeeper, ext=jar, module=zookeeper,
organisation=org.apache.zookeeper, type=jar, revision=3.4.6}
```
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