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

    https://github.com/apache/flink/pull/5459#discussion_r167608020
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/configuration/CoreOptions.java ---
    @@ -127,7 +130,30 @@
         */
        public static final ConfigOption<String> DEFAULT_FILESYSTEM_SCHEME = 
ConfigOptions
                        .key("fs.default-scheme")
    -                   .noDefaultValue();
    +                   .noDefaultValue()
    +                   .withDescription("The default filesystem scheme, used 
for paths that do not declare a scheme explicitly.");
    --- End diff --
    
    ah I remember now, looking at the description:
    
    [Part1]
    The default filesystem scheme to be used
    
    [Part2]
    , with the necessary authority to contact, e.g. the host:port of the 
NameNode in the case of HDFS (if needed).
    
    [Part3]
    By default, this is set to file:/// which points to the local filesystem. 
This means that the local filesystem is going to be used to search for 
user-specified files without an explicit scheme definition.
    
    [Part4]
    This scheme is used ONLY if no other scheme is specified (explicitly) in 
the user-provided URI.
    
    Part 1 and 4 are contained in the description, part 3 was left out since 
file:/// isn't the documented default. Only part 2 is really missing.


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