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From "Xiangrui Meng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-10382) Make example code in user guide testable
Date Thu, 10 Sep 2015 16:21:46 GMT

    [ https://issues.apache.org/jira/browse/SPARK-10382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14739042#comment-14739042
] 

Xiangrui Meng commented on SPARK-10382:
---------------------------------------

[~holdenk] I think this might be related to testing example code in books. What's your experience?

> Make example code in user guide testable
> ----------------------------------------
>
>                 Key: SPARK-10382
>                 URL: https://issues.apache.org/jira/browse/SPARK-10382
>             Project: Spark
>          Issue Type: Brainstorming
>          Components: Documentation, ML, MLlib
>            Reporter: Xiangrui Meng
>            Assignee: Xiangrui Meng
>            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 "guide" and put them under `{% highlight %}` in the markdown.
We can discuss the syntax for marker comments.
> Just one way to implement this. It would be nice to hear more ideas.



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