Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/23017
yeah, it's hanging on my laptop too. seems stuck here and using all the CPU:
```
"BuilderThread 3" #97 prio=5 os_prio=0 tid=0x00007f76b8609800 nid=0x640d
runnable [0x00007f7648f7d000]
java.lang.Thread.State: RUNNABLE
at org.jdom2.Element.isAncestor(Element.java:1052)
at org.jdom2.ContentList.checkPreConditions(ContentList.java:222)
at org.jdom2.ContentList.add(ContentList.java:244)
at org.jdom2.Element.addContent(Element.java:950)
at
org.apache.maven.plugins.shade.pom.MavenJDOMWriter.insertAtPreferredLocation(MavenJDOMWriter.java:292)
at
org.apache.maven.plugins.shade.pom.MavenJDOMWriter.iterateExclusion(MavenJDOMWriter.java:488)
at
org.apache.maven.plugins.shade.pom.MavenJDOMWriter.updateDependency(MavenJDOMWriter.java:1335)
at
org.apache.maven.plugins.shade.pom.MavenJDOMWriter.iterateDependency(MavenJDOMWriter.java:386)
```
I've seen this stuff before, will take a look at the pom and file a
separate bug. No point in polluting this PR even more.
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