[jira] [Created] (SPARK-13942) Remove Shark-related docs and visibility for 2.x

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

Dongjoon Hyun created SPARK-13942:
-------------------------------------

             Summary: Remove Shark-related docs and visibility for 2.x
                 Key: SPARK-13942
                 URL: https://issues.apache.org/jira/browse/SPARK-13942
             Project: Spark
          Issue Type: Task
          Components: Documentation, Spark Core
            Reporter: Dongjoon Hyun
            Priority: Minor


`Shark` was merged into `Spark SQL` since [July 2014|https://databricks.com/blog/2014/07/01/shark-spark-sql-hive-on-spark-and-the-future-of-sql-on-spark.html]. 

The followings seem to be the only legacy.

*Migration Guide*
{code:title=sql-programming-guide.md|borderStyle=solid}
- ## Migration Guide for Shark Users
- ...
- ### Scheduling
- ...
- ### Reducer number
- ...
- ### Caching
{code}

*SparkEnv visibility and comments*
{code:title=sql-programming-guide.md|borderStyle=solid}
- *
- * NOTE: This is not intended for external use. This is exposed for Shark and may be made private
- *       in a future release.
  */
 @DeveloperApi
-class SparkEnv (
+private[spark] class SparkEnv (
{code}

For Spark 2.x, we had better clean up those docs and comments in any way. However, the visibility of `SparkEnv` class might be controversial. 

At the first attempt, this issue proposes to change both stuff according to the note(`This is exposed for Shark`). During review process, the change on visibility might be removed.



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