in hadoop-api-shim/src/main/java/org/apache/hadoop/fs/shim/impl/AbstractFSBuilderImpl.java [262:273]
public static void rejectUnknownMandatoryKeys(
final Set<String> mandatory,
final Collection<String> knownKeys,
final String extraErrorText)
throws IllegalArgumentException {
final String eText = extraErrorText.isEmpty()
? ""
: (extraErrorText + " ");
mandatory.forEach((key) ->
checkArgument(knownKeys.contains(key),
UNKNOWN_MANDATORY_KEY + " %s\"%s\"", eText, key));
}