[GitHub] spark pull request #22446: [SPARK-19550][DOC][FOLLOW-UP] Update tuning.md to...
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[GitHub] spark pull request #22446: [SPARK-19550][DOC][FOLLOW-UP] Update tuning.md to...
GitHub user wangyum opened a pull request: https://github.com/apache/spark/pull/22446 [SPARK-19550][DOC][FOLLOW-UP] Update tuning.md to use JDK8 ## What changes were proposed in this pull request? Update `tuning.md` and `building-spark.md` to use JDK8. ## How was