[GitHub] flink issue #3190: [FLINK-5546][build] java.io.tmpdir setted as project buil...

[shijinkui]

Github user shijinkui commented on the issue:

    https://github.com/apache/flink/pull/3190
  
    @StephanEwen I have use TemporaryFolder to replace creating File manually. 
    There are some tips:
    1. TemporaryFolder should invoke `create()` in setup manually
    2. in `shutdown()` should invoke `tmp.delete()` to delete all the dir and 
files recursively.
    3. file name add random string
    
    the generated files like this in root directory 
`flink/flink-runtime/target/tmp`:
    
    ```
    tmp/
    └── junit4955582781992164088
        ├── 1fde53fa-7f7c-4f55-921c-04d078601cfd
        │   └── flink-dist-cache-664fc7de-51af-4fc1-86a0-3d8c76bb65df
        ├── 30326e4a-205f-4982-a920-e790a7f52730
        │   └── flink-dist-cache-d3eb183b-ca0c-4b23-877f-adf1540d6563
        │       └── b217df314c282e23301ba8f8351fca5c
        │           └── cacheFile1e7f5410-2326-4916-8a50-986d49393a7f
        ├── 35b19e4e-1515-4f93-813e-d4a40b09baeb
        │   └── flink-dist-cache-af593973-73a0-4996-8323-40978a703317
        ├── c754952f-fe8d-465f-9424-1303e734e990
        │   └── flink-dist-cache-18f1984b-84ca-4db1-be2c-d2a3bc0a5fe3
        ├── cacheFile1e7f5410-2326-4916-8a50-986d49393a7f
        └── fde2c7bc-8bb1-43ec-8e12-21510322b2b1
            └── flink-dist-cache-b34f1e0b-79a7-4cf7-ab3f-7a7a93a04d73
    ```



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