[GitHub] [flink] TisonKun commented on issue #6721: [FLINK-10376] [tests] Replace mkdirTolerateExisting by thread safe Files#createDirectories

[GitHub]

travis gives green and the unstable one is theoretically hardened. 
@tillrohrmann  

[ Full content available at: https://github.com/apache/flink/pull/6721 ]
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