apache/hadoop · error · IllegalArgumentException

Host location component index out of range.

Error message

Host location component index out of range.

What it means

Error "Host location component index out of range." thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/ParsedHost.java:54

      .compile("/([^/]+)/([^/]+)");

  /**
   * TODO handle arbitrary level of network names.
   */
  static int numberOfDistances() {
    return 3;
  }

  String nameComponent(int i) throws IllegalArgumentException {
    switch (i) {
    case 0:
      return rackName;

    case 1:
      return nodeName;

    default:
      throw new IllegalArgumentException(
          "Host location component index out of range.");
    }
  }

  @Override
  public int hashCode() {
    return rackName.hashCode() * 17 + nodeName.hashCode();
  }

  public static ParsedHost parse(String name) {
    // separate out the node name
    Matcher matcher = splitPattern.matcher(name);

    if (!matcher.matches())
      return null;

    return new ParsedHost(matcher.group(1), matcher.group(2));
  }

View on GitHub (pinned to 2add963021)

Solutions

1. Check the host name string; the requested location component index exceeds the number of path components.

When it happens

Trigger: A host location component index is requested beyond the number of location components parsed from the host name.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/cacfc64610d981d1. Report an issue: GitHub.