Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1850#issuecomment-206259647
I think we have a winner now. I changed the backup options to not back up
the WAL. This seems to have been the problem. Only logical since there is no
WAL anymore...
Before, 2 out of 5 travis runs (i.e. 5*5) would have errors. Now all 5 runs
that I started were successful.
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