XD-DENG commented on issue #3746: [AIRFLOW-2896] Improve HdfsSensor() URL: https://github.com/apache/incubator-airflow/pull/3746#issuecomment-413070866 1 out of 9 tests failed due to `ERROR: InvocationError for command '/home/travis/build/apache/incubator-airflow/scripts/ci/setup_env.sh' (exited with code 1)` ` /home/travis/.travis_cache//cdh/hadoop.tar.gz: Cannot open: Permission denied` Not sure whether it's a Travis-CI issue.
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