Github user zentol commented on the pull request:
https://github.com/apache/flink/pull/1664#issuecomment-185741473
The mkdirs() command failed for me on Windows. While debugging i noticed
that mkdirs provides no means of accessing the reason why it failed.
Files.createDirectories() is supposed to be more explicit with errors, and
,surprisingly enough, succeeded where mkdirs failed right away.
During the failure i also got an NullPointerException in close() since
brokers wasn't initialized, so i added a null check.
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