Github user zentol commented on a diff in the pull request:
    --- Diff: 
flink-core/src/main/java/org/apache/flink/configuration/ ---
    @@ -127,7 +130,30 @@
        public static final ConfigOption<String> DEFAULT_FILESYSTEM_SCHEME = 
    -                   .noDefaultValue();
    +                   .noDefaultValue()
    +                   .withDescription("The default filesystem scheme, used 
for paths that do not declare a scheme explicitly.");
    --- End diff --
    Yes, in a practical sense "file:///" is the default due to how `FileSystem` 
works. We can't define it as the official default at the moment because of OS 
compatibility, see LocalFileSystem:
    LOCAL_URI = OperatingSystem.isWindows() ? URI.create("file:/") : 
    Not sure whether that is really necessary though, but the scheme parsing by 
`Paths` is a [bit wonky on 


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