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[SPARK-4952][Core]Handle ConcurrentModificationExceptions in SparkEnv…
….environmentDetails Author: GuoQiang Li <witgo@qq.com> Closes #3788 from witgo/SPARK-4952 and squashes the following commits: d903529 [GuoQiang Li] Handle ConcurrentModificationExceptions in SparkEnv.environmentDetails (cherry picked from commit 080ceb7) Signed-off-by: Patrick Wendell <pwendell@gmail.com>
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