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 this patch tested?
manual tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark java8
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22446.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #22446
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commit f8924bb0ce876beb35309ea51f1c1c42497d26e0
Author: Yuming Wang <yumwang@...>
Date: 2018-09-18T01:14:04Z
To java 8
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