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https://issues.apache.org/jira/browse/SPARK-4819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086083#comment-15086083
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Markus Weimer commented on SPARK-4819:
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Over in REEF, we just backportd Java 8's [[Optional<T>]] class. Would that be
an option for Spark as well? If so, maybe this could go to one of the commons
packages such that we don't clone the same trivial class over and over again :-)
> Remove Guava's "Optional" from public API
> -----------------------------------------
>
> Key: SPARK-4819
> URL: https://issues.apache.org/jira/browse/SPARK-4819
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 1.2.0
> Reporter: Marcelo Vanzin
> Assignee: Sean Owen
> Attachments: SPARK_4819_null_do_not_merge.patch
>
>
> Filing this mostly so this isn't forgotten. Spark currently exposes Guava
> types in its public API (the {{Optional}} class is used in the Java
> bindings). This makes it hard to properly hide Guava from user applications,
> and makes mixing different Guava versions with Spark a little sketchy (even
> if things should work, since those classes are pretty simple in general).
> Since this changes the public API, it has to be done in a release that allows
> such breakages. But it would be nice to at least have a transition plan for
> deprecating the affected APIs.
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