apache/druid · warning · UOE

This Jobby does not implement getJobStats(), Jobby class

Error message

This Jobby does not implement getJobStats(), Jobby class: [%s]

What it means

Jobby's default getStats() implementation is a stub that throws UOE. A Jobby implementation that does not override getJobStats()-equivalent stats access causes this error when someone asks for job statistics.

Solutions

Override getStats() in the Jobby implementation to return the job's stats map.
Avoid calling getStats() on implementations known not to support stats (or check instanceof a stats-capable type).
Wrap the call in try-catch for UOE and treat stats as unavailable.

Example fix

// before
class MyJob implements Jobby { /* no getStats */ }
// after
@Override
@Nullable
public Map<String, Object> getStats() { return myStatsMap; }

Defensive patterns

Strategy: try-catch

Validate before calling

if (!(job instanceof StatsCapableJobby)) { return null; }

Type guard

boolean supportsStats(Object job) { try { job.getClass().getMethod("getStats"); return true; } catch (NoSuchMethodException e) { return false; } }

Try / catch

try { stats = job.getStats(); } catch (UOE e) { log.warn("Stats unsupported for {}: {}", job.getClass(), e.getMessage()); stats = null; }

Prevention

Override getStats() in every custom Jobby implementation
Do not assume all Jobby implementations expose stats
Default stats to null/absent in monitoring code

When it happens

Trigger: Calling getStats() on a Jobby implementation (e.g. a custom job or one of Druid's simple Jobby implementations) that has not overridden getStats().

Common situations: Custom HadoopDruidIndexer job extensions; monitoring/reporting code that uniformly calls getStats() on all jobs in a JobbyContainer.

Related errors

AI-assisted analysis of apache/druid@9b90983fd2 (2026-09-07). Data as JSON: /api/errors/edcf418eacfdc14e. Report an issue: GitHub.

Appendix: source

Thrown at processing/src/main/java/org/apache/druid/indexer/Jobby.java:39

import org.apache.druid.java.util.common.UOE;

import javax.annotation.Nullable;
import java.util.Map;

/**
 */
public interface Jobby
{
  boolean run();

  /**
   * @return A map containing statistics for a Jobby, optionally null if the Jobby is unable to provide stats.
   */
  @Nullable
  default Map<String, Object> getStats()
  {
    throw new UOE("This Jobby does not implement getJobStats(), Jobby class: [%s]", getClass());
  }

  /**
   * @return A string representing the error that caused a Jobby to fail. Can be null if the Jobby did not fail,
   * or is unable to provide an error message.
   */
  @Nullable
  default String getErrorMessage()
  {
    throw new UOE("This Jobby does not implement getErrorMessage(), Jobby class: [%s]", getClass());
  }
}

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