apache/hadoop · error · IllegalArgumentException

Too many arguments, Max=2 arguments allowed

Error message

Too many arguments, Max=2 arguments allowed

What it means

Error "Too many arguments, Max=2 arguments allowed" thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/tools/federation/RouterAdmin.java:245

  private void validateMax(String[] arg) {
    if (arg[0].equals("-ls")) {
      if (arg.length > 3) {
        throw new IllegalArgumentException(
            "Too many arguments, Max=2 argument allowed");
      }
    } else if (arg[0].equals("-getDestination")) {
      if (arg.length > 2) {
        throw new IllegalArgumentException(
            "Too many arguments, Max=1 argument allowed only");
      }
    } else if (arg[0].equals("-safemode")) {
      if (arg.length > 2) {
        throw new IllegalArgumentException(
            "Too many arguments, Max=1 argument allowed only");
      }
    } else if (arg[0].equals("-nameservice")) {
      if (arg.length > 3) {
        throw new IllegalArgumentException(
            "Too many arguments, Max=2 arguments allowed");
      }
    } else if (arg[0].equals("-getDisabledNameservices")) {
      if (arg.length > 1) {
        throw new IllegalArgumentException("No arguments allowed");
      }
    } else if (arg[0].equals("-refreshSuperUserGroupsConfiguration")) {
      if (arg.length > 1) {
        throw new IllegalArgumentException("No arguments allowed");
      }
    } else if (arg[0].equals("-refreshCallQueue") ||
        arg[0].equals(DUMP_COMMAND)) {
      if (arg.length > 1) {
        throw new IllegalArgumentException("No arguments allowed");
      }
    }
  }

View on GitHub (pinned to 2add963021)

Solutions

1. Pass at most 2 arguments to this subcommand.
2. Use -help to verify the expected syntax.

When it happens

Trigger: RouterAdmin argument parsing: more than 2 positional arguments supplied.

Common situations: Surplus arguments given to a two-argument dfsrouteradmin command.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/083e84047096c386. Report an issue: GitHub.