apache/hadoop · error · IllegalArgumentException

taskId cannot be null

Error message

taskId cannot be null

What it means

Error "taskId cannot be null" thrown in apache/hadoop.

Source

Thrown at hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/TaskAttemptID.java:62

 * 
 * @see JobID
 * @see TaskID
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class TaskAttemptID extends org.apache.hadoop.mapred.ID {
  protected static final String ATTEMPT = "attempt";
  private TaskID taskId;
  
  /**
   * Constructs a TaskAttemptID object from given {@link TaskID}.  
   * @param taskId TaskID that this task belongs to  
   * @param id the task attempt number
   */
  public TaskAttemptID(TaskID taskId, int id) {
    super(id);
    if(taskId == null) {
      throw new IllegalArgumentException("taskId cannot be null");
    }
    this.taskId = taskId;
  }
  
  /**
   * Constructs a TaskId object from given parts.
   * @param jtIdentifier jobTracker identifier
   * @param jobId job number 
   * @param type the TaskType 
   * @param taskId taskId number
   * @param id the task attempt number
   */
  public TaskAttemptID(String jtIdentifier, int jobId, TaskType type, 
                       int taskId, int id) {
    this(new TaskID(jtIdentifier, jobId, type, taskId), id);
  }

  /**

View on GitHub (pinned to 2add963021)

Solutions

1. Pass a non-null TaskID when constructing the TaskAttemptID.

When it happens

Trigger: Thrown at hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/TaskAttemptID.java:62 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/cdf2dd0e8a3718ab. Report an issue: GitHub.