xkrogen commented on issue #1320: HDFS-14755. [Dynamometer] Hadoop-2 DataNode 
fail to start
URL: https://github.com/apache/hadoop/pull/1320#issuecomment-523549105
 
 
   Can you explain why it works? This is the code `MiniDFSCluster` uses to 
parse it (within `GenericTestUtils`):
   ```
     public static File getTestDir() {
       String prop = System.getProperty(SYSPROP_TEST_DATA_DIR, 
DEFAULT_TEST_DATA_DIR);
       if (prop.isEmpty()) {
         // corner case: property is there but empty
         prop = DEFAULT_TEST_DATA_DIR;
       }
       File dir = new File(prop).getAbsoluteFile();
   ```
   (`SYSPROP_TEST_DATA_DIR` is the same as `PROP_TEST_BUILD_DATA`)
   
   I would expect `new File(prop)` to complain if you give it a comma-separated 
list of directories.

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