Hi, All.

Recently, Apache Spark master branch test (SBT with hadoop-2.7 / 2.6) has been 
hitting the build timeout.

Please see the build time trend.

https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-master-test-sbt-hadoop-2.7/buildTimeTrend

All recent 22 builds fail due to timeout directly/indirectly. The last success 
(SBT with Hadoop-2.7) is 15th August.

We may do the followings.


  1.  Increase Build Timeout (3 hr 30 min)
  2.  Optimize UTs (Scala/Java/Python/UT)

But, Option 1 will be the immediate solution for now . Could you update the 
Jenkins setup?

Bests,
Dongjoon.

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