apache/hadoop · error · RuntimeException

Unexpected type of taskAttempts in the list...

Error message

Unexpected type of taskAttempts in the list...

What it means

Error "Unexpected type of taskAttempts in the list..." thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/ParsedTask.java:110

  }

  /**
   * @return the list of attempts of this task.
   */
  public List<ParsedTaskAttempt> obtainTaskAttempts() {
    List<LoggedTaskAttempt> attempts = getAttempts();
    return convertTaskAttempts(attempts);
  }

  List<ParsedTaskAttempt> convertTaskAttempts(
      List<LoggedTaskAttempt> attempts) {
    List<ParsedTaskAttempt> result = new ArrayList<ParsedTaskAttempt>();

    for (LoggedTaskAttempt t : attempts) {
      if (t instanceof ParsedTaskAttempt) {
        result.add((ParsedTaskAttempt)t);
      } else {
        throw new RuntimeException(
            "Unexpected type of taskAttempts in the list...");
      }
    }
    return result;
  }

  /** Dump the extra info of ParsedTask */
  void dumpParsedTask() {
    LOG.info("ParsedTask details:" + obtainCounters()
        + "\n" + obtainFailedDueToAttemptId()
        + "\nPreferred Locations are:");
    List<LoggedLocation> loc = getPreferredLocations();
    for (LoggedLocation l : loc) {
      LOG.info(l.getLayers() + ";" + l.toString());
    }
    List<ParsedTaskAttempt> attempts = obtainTaskAttempts();
    for (ParsedTaskAttempt attempt : attempts) {
      attempt.dumpParsedTaskAttempt();

View on GitHub (pinned to 2add963021)

Solutions

1. Ensure all entries in the task attempt list are ParsedTaskAttempt instances.

When it happens

Trigger: ParsedTask encounters a task attempt object of an unexpected runtime type in its attempt list, indicating corrupted deserialized task data.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/f77b6f4f97faee03. Report an issue: GitHub.