Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/10558#issuecomment-168458295
Aha! It looks like the code for resetting the version has a problem:
```
+ build/mvn --force -q versions:set '-DnewVersion=
``
`OLD_VERSION` isn't being set properly:
```
+ OLD_VERSION='
[WARNING] The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 is
missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for
org.eclipse.m2e:lifecycle-mapping:1.0.0: Plugin
org.eclipse.m2e:lifecycle-mapping:1.0.0 or one of its dependencies could not be
resolved: Could not find artifact org.eclipse.m2e:lifecycle-mapping:jar:1.0.0
in central (https://repo1.maven.org/maven2)
2.0.0-SNAPSHOT'
```
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