Wenlong Lyu created FLINK-5817:

             Summary: Fix test concurrent execution failure by test dir 
                 Key: FLINK-5817
                 URL: https://issues.apache.org/jira/browse/FLINK-5817
             Project: Flink
          Issue Type: Bug
            Reporter: Wenlong Lyu
            Assignee: Wenlong Lyu

Currently when different users build flink on the same machine, failure may 
happen because some test utilities create test file using the fixed name, which 
will cause file access failing when different user processing the same file at 
the same time.
We have found errors from AbstractTestBase, IOManagerTest, FileCacheTest.

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