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https://issues.apache.org/jira/browse/SPARK-11337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14981957#comment-14981957
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Xiangrui Meng commented on SPARK-11337:
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I think it is a minor issue if we import more the necessary. Solution 1 should
work for now. i thin it is more important to reserve empty lines and insert a
link to the source file after {% highlight %}.
> Make example code in user guide testable
> ----------------------------------------
>
> Key: SPARK-11337
> URL: https://issues.apache.org/jira/browse/SPARK-11337
> Project: Spark
> Issue Type: Umbrella
> Components: Documentation
> Reporter: Xiangrui Meng
> Assignee: Xusen Yin
> Priority: Critical
>
> The example code in the user guide is embedded in the markdown and hence it
> is not easy to test. It would be nice to automatically test them. This JIRA
> is to discuss options to automate example code testing and see what we can do
> in Spark 1.6.
> One option I propose is to move actual example code to spark/examples and
> test compilation in Jenkins builds. Then in the markdown, we can reference
> part of the code to show in the user guide. This requires adding a Jekyll tag
> that is similar to
> https://github.com/jekyll/jekyll/blob/master/lib/jekyll/tags/include.rb,
> e.g., called include_example.
> {code}
> {% include_example scala ml.KMeansExample guide %}
> {code}
> Jekyll will find
> `examples/src/main/scala/org/apache/spark/examples/ml/KMeansExample.scala`
> and pick code blocks marked "example" and put them under `{% highlight %}` in
> the markdown. We can discuss the syntax for marker comments.
> Sub-tasks are created to move example code from user guide to `examples/`.
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