apache/hadoop · error · YarnException

No task for the job!

Error message

No task for the job!

What it means

Error "No task for the job!" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/AMDefinitionSLS.java:43

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class AMDefinitionSLS extends AMDefinition {
  public AMDefinitionSLS(AmDefinitionBuilder builder) {
    super(builder);
  }

  public String getQueue() {
    return queue;
  }

  public static List<ContainerSimulator> getTaskContainers(Map<String, ?> jsonJob,
      SLSRunner slsRunner) throws YarnException {
    List<Map<String, String>> tasks = (List) jsonJob.get(SLSConfiguration.JOB_TASKS);
    if (tasks == null || tasks.size() == 0) {
      throw new YarnException("No task for the job!");
    }

    List<ContainerSimulator> containers = new ArrayList<>();
    for (Map<String, String> jsonTask : tasks) {
      TaskContainerDefinition containerDef =
          TaskContainerDefinition.Builder.create()
              .withCount(jsonTask, SLSConfiguration.COUNT)
              .withHostname(jsonTask.get(SLSConfiguration.TASK_HOST))
              .withDuration(jsonTask, SLSConfiguration.TASK_DURATION_MS)
              .withDurationLegacy(jsonTask, SLSConfiguration.DURATION_MS)
              .withTaskStart(jsonTask, SLSConfiguration.TASK_START_MS)
              .withTaskFinish(jsonTask, SLSConfiguration.TASK_END_MS)
              .withResource(getResourceForContainer(jsonTask, slsRunner))
              .withPriority(jsonTask, SLSConfiguration.TASK_PRIORITY)
              .withType(jsonTask, SLSConfiguration.TASK_TYPE)
              .withExecutionType(jsonTask, SLSConfiguration.TASK_EXECUTION_TYPE)
              .withAllocationId(jsonTask, SLSConfiguration.TASK_ALLOCATION_ID)
              .withRequestDelay(jsonTask, SLSConfiguration.TASK_REQUEST_DELAY)

View on GitHub (pinned to 2add963021)

Solutions

1. Ensure the SLS trace job entry contains at least one task.

When it happens

Trigger: A job in the SLS trace contains no map or reduce tasks, so the simulated AM has nothing to run.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/e5279ebbe7468f1d. Report an issue: GitHub.