Github user NicoK commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4234#discussion_r131431720
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/blob/BlobCacheSuccessTest.java
 ---
    @@ -92,15 +100,15 @@ private void uploadFileGetTest(final Configuration 
config, boolean cacheWorksWit
                BlobCache blobCache = null;
                BlobStoreService blobStoreService = null;
                try {
    -                   final Configuration cacheConfig;
    -                   if (cacheHasAccessToFs) {
    -                           cacheConfig = config;
    -                   } else {
    -                           // just in case parameters are still read from 
the server,
    -                           // create a separate configuration object for 
the cache
    -                           cacheConfig = new Configuration(config);
    +                   final Configuration cacheConfig = new 
Configuration(config);
    +                   
cacheConfig.setString(BlobServerOptions.STORAGE_DIRECTORY,
    +                           temporaryFolder.newFolder().getAbsolutePath());
    +                   if (!cacheHasAccessToFs) {
    +                           // make sure the cache cannot access the HA 
store directly
    +                           
cacheConfig.setString(BlobServerOptions.STORAGE_DIRECTORY,
    +                                   
temporaryFolder.newFolder().getAbsolutePath());
    --- End diff --
    
    seems that it wasn't used to its full extension - also the meaning of this 
variable was not what clear


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