apache/hadoop · error · IOException

The server is stopped.

Error message

The server is stopped.

What it means

Error "The server is stopped." thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/ReconfigurableBase.java:174

      synchronized (parent.reconfigLock) {
        parent.endTime = Time.now();
        parent.status = Collections.unmodifiableMap(results);
        parent.reconfigThread = null;
      }
    }
  }

  /**
   * Start a reconfiguration task to reload configuration in background.
   * @throws IOException raised on errors performing I/O.
   */
  public void startReconfigurationTask() throws IOException {
    synchronized (reconfigLock) {
      if (!shouldRun) {
        String errorMessage = "The server is stopped.";
        LOG.warn(errorMessage);
        throw new IOException(errorMessage);
      }
      if (reconfigThread != null) {
        String errorMessage = "Another reconfiguration task is running.";
        LOG.warn(errorMessage);
        throw new IOException(errorMessage);
      }
      reconfigThread = new ReconfigurationThread(this);
      reconfigThread.setDaemon(true);
      reconfigThread.setName("Reconfiguration Task");
      reconfigThread.start();
      startTime = Time.now();
    }
  }

  public ReconfigurationTaskStatus getReconfigurationTaskStatus() {
    synchronized (reconfigLock) {
      if (reconfigThread != null) {
        return new ReconfigurationTaskStatus(startTime, 0, null);

View on GitHub (pinned to 2add963021)

Solutions

1. Start the reconfigurable server before invoking reconfiguration operations.

Example fix

Call startReconfigurationTask only while the server is running.

When it happens

Trigger: Raised at runtime when the documented precondition or configuration requirement for this operation is violated.

Common situations: Misconfigured or missing property, invalid user input, or calling the API before its prerequisites are met.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/d5d9bb48723dfb49. Report an issue: GitHub.