Github user shijinkui commented on the issue:
https://github.com/apache/flink/pull/3190
> Can we just use the ${project.build.directory} as java.io.tmpdir ?
@wenlong88 Sorry for late reply.
It's good question. If use `${project.build.directory}` without sub
directory `tmp`, the UT will create various directories, maybe the directories
overlap with other dir, such as `classes`ï¼`surefire-reports` and so on.
Using a special dir `tmp` can avoid the probability of directory conflict.
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