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https://issues.apache.org/jira/browse/TOREE-395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15936567#comment-15936567
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Ryan Blue commented on TOREE-395:
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I don't think there is a reason to keep it. When using Toree with Jupyter
notebooks, the user doesn't see the second copy of results. That opens up the
possibility to print sensitive data as was already pointed out, but, more
importantly, it pollutes the notebook server log with results that aren't
useful when you go to look at it. Is there a use case for notebooks that you
can think of that makes this a useful feature?
The other environment to think about is Jupyter console. When you use Toree
with the console, everything gets printed as cell output (which my PR
addresses) and is printed to stdout. That it produces double output is the main
reason why we disabled it.
> Provide a way to disable automatic printing of results in Toree Scala
> ---------------------------------------------------------------------
>
> Key: TOREE-395
> URL: https://issues.apache.org/jira/browse/TOREE-395
> Project: TOREE
> Issue Type: Improvement
> Affects Versions: 0.2.0
> Reporter: Kun Liu
>
> Scala REPL supports a flag, ":silent" to enable/disable automatic printing of
> results (those messages begin with "res"). This is also supported in Spark
> shell. But for Toree Scala kernel, this flag is not supported. Thus the
> result of a cell would be always printed.
> But if there is any logging mechanism, the results would be recorded in a log
> file, while this may not be desirable. For instance, a user may not want any
> sensitive data logged when running "dataRDD.take(5)" in a cell.
> Also found the possible source codes for this:
> https://github.com/apache/incubator-toree/blob/master/scala-interpreter/src/main/scala/org/apache/toree/kernel/interpreter/scala/ScalaInterpreter.scala
> There are three methods with silent: Boolean = false as parameter.
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