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Dongjoon Hyun authored
## What changes were proposed in this pull request? Since Spark 2.1.0, Travis CI was supported by SPARK-15207 for automated PR verification (JDK7/JDK8 maven compilation and Java Linter) and contributors can see the additional result via their Travis CI dashboard (or PC). This PR aims to make `.travis.yml` up-to-date by removing JDK7 which was removed via SPARK-19550. ## How was this patch tested? See the result via Travis CI. - https://travis-ci.org/dongjoon-hyun/spark/builds/207111713 Author: Dongjoon Hyun <dongjoon@apache.org> Closes #17143 from dongjoon-hyun/SPARK-19801.
Dongjoon Hyun authored## What changes were proposed in this pull request? Since Spark 2.1.0, Travis CI was supported by SPARK-15207 for automated PR verification (JDK7/JDK8 maven compilation and Java Linter) and contributors can see the additional result via their Travis CI dashboard (or PC). This PR aims to make `.travis.yml` up-to-date by removing JDK7 which was removed via SPARK-19550. ## How was this patch tested? See the result via Travis CI. - https://travis-ci.org/dongjoon-hyun/spark/builds/207111713 Author: Dongjoon Hyun <dongjoon@apache.org> Closes #17143 from dongjoon-hyun/SPARK-19801.
