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.