Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/16264 Yup, it seems failed time to time due to network problem. FYI, there was some discussions about this in https://github.com/apache/spark/pull/15686#issuecomment-257217562 and https://github.com/apache/spark/pull/15697#issuecomment-257721992 I could not find a workaround to re-trigger this so far and it seems (I manually checked and privately asked if it is true) some Apahce projects using Travis CI/AppVeyor are also re-triggering this via closing and opening.
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