apache/hadoop · error · IllegalArgumentException

Node name cannot be null

Error message

Node name cannot be null

What it means

Error "Node name cannot be null" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/Node.java:45

 * {@link MachineNode}, or a {@link RackNode}, etc.
 */
public class Node implements Comparable<Node> {
  private static final SortedSet<Node> EMPTY_SET = 
    Collections.unmodifiableSortedSet(new TreeSet<Node>());
  private Node parent;
  private final String name;
  private final int level;
  private SortedSet<Node> children;

  /**
   * @param name
   *          A unique name to identify a node in the cluster.
   * @param level
   *          The level of the node in the cluster
   */
  public Node(String name, int level) {
    if (name == null) {
      throw new IllegalArgumentException("Node name cannot be null");
    }

    if (level < 0) {
      throw new IllegalArgumentException("Level cannot be negative");
    }

    this.name = name;
    this.level = level;
  }

  /**
   * Get the name of the node.
   * 
   * @return The name of the node.
   */
  public String getName() {
    return name;
  }

View on GitHub (pinned to 2add963021)

Solutions

1. Provide a non-null node name when constructing the topology node.

When it happens

Trigger: A Rumen topology Node is constructed with a null name, which is rejected.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/2a8d2597d050c930. Report an issue: GitHub.