Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/5694#issuecomment-112503112
```
========================================================================
Building Spark Documentation
========================================================================
[error] Cannot find a version of `jekyll` on the system; please install one
and retry to build documentation.
```
AFAIK the doc builder dependencies are only installed on one of the nodes.
For expediency's sake, I think we should just disable the documentation
building in this PRB for now, but keep the logic which skips the full unit
tests for doc-only changes.
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