How to use

shutdown

method

in

org.apache.hadoop.hdfs.server.datanode.VolumeScanner

/**
 * Stops and removes all volume scanners.<p/>
 *
 * This function will block until all the volume scanners have stopped.
 */
public synchronized void removeAllVolumeScanners() {
 for (Entry<String, VolumeScanner> entry : scanners.entrySet()) {
  entry.getValue().shutdown();
 }
 for (Entry<String, VolumeScanner> entry : scanners.entrySet()) {
  Uninterruptibles.joinUninterruptibly(entry.getValue(),
    5, TimeUnit.MINUTES);
 }
 scanners.clear();
}

/**
 * Stops and removes a volume scanner.<p/>
 *
 * This function will block until the volume scanner has stopped.
 *
 * @param volume           The volume to remove.
 */
public synchronized void removeVolumeScanner(FsVolumeSpi volume) {
 if (!isEnabled()) {
  LOG.debug("Not removing volume scanner for {}, because the block " +
    "scanner is disabled.", volume.getStorageID());
  return;
 }
 VolumeScanner scanner = scanners.get(volume.getStorageID());
 if (scanner == null) {
  LOG.warn("No scanner found to remove for volumeId {}",
    volume.getStorageID());
  return;
 }
 LOG.info("Removing scanner for volume {} (StorageID {})",
   volume, volume.getStorageID());
 scanner.shutdown();
 scanners.remove(volume.getStorageID());
 Uninterruptibles.joinUninterruptibly(scanner, 5, TimeUnit.MINUTES);
}

/**
 * Stops and removes all volume scanners.<p/>
 *
 * This function will block until all the volume scanners have stopped.
 */
public synchronized void removeAllVolumeScanners() {
 for (Entry<String, VolumeScanner> entry : scanners.entrySet()) {
  entry.getValue().shutdown();
 }
 for (Entry<String, VolumeScanner> entry : scanners.entrySet()) {
  Uninterruptibles.joinUninterruptibly(entry.getValue(),
    5, TimeUnit.MINUTES);
 }
 scanners.clear();
}

/**
 * Stops and removes all volume scanners.<p/>
 *
 * This function will block until all the volume scanners have stopped.
 */
public synchronized void removeAllVolumeScanners() {
 for (Entry<String, VolumeScanner> entry : scanners.entrySet()) {
  entry.getValue().shutdown();
 }
 for (Entry<String, VolumeScanner> entry : scanners.entrySet()) {
  Uninterruptibles.joinUninterruptibly(entry.getValue(),
    5, TimeUnit.MINUTES);
 }
 scanners.clear();
}

/**
 * Stops and removes a volume scanner.<p/>
 *
 * This function will block until the volume scanner has stopped.
 *
 * @param volume           The volume to remove.
 */
public synchronized void removeVolumeScanner(FsVolumeSpi volume) {
 if (!isEnabled()) {
  LOG.debug("Not removing volume scanner for {}, because the block " +
    "scanner is disabled.", volume.getStorageID());
  return;
 }
 VolumeScanner scanner = scanners.get(volume.getStorageID());
 if (scanner == null) {
  LOG.warn("No scanner found to remove for volumeId {}",
    volume.getStorageID());
  return;
 }
 LOG.info("Removing scanner for volume {} (StorageID {})",
   volume.getBasePath(), volume.getStorageID());
 scanner.shutdown();
 scanners.remove(volume.getStorageID());
 Uninterruptibles.joinUninterruptibly(scanner, 5, TimeUnit.MINUTES);
}

/**
 * Stops and removes a volume scanner.<p/>
 *
 * This function will block until the volume scanner has stopped.
 *
 * @param volume           The volume to remove.
 */
public synchronized void removeVolumeScanner(FsVolumeSpi volume) {
 if (!isEnabled()) {
  LOG.debug("Not removing volume scanner for {}, because the block " +
    "scanner is disabled.", volume.getStorageID());
  return;
 }
 VolumeScanner scanner = scanners.get(volume.getStorageID());
 if (scanner == null) {
  LOG.warn("No scanner found to remove for volumeId {}",
    volume.getStorageID());
  return;
 }
 LOG.info("Removing scanner for volume {} (StorageID {})",
   volume.getBasePath(), volume.getStorageID());
 scanner.shutdown();
 scanners.remove(volume.getStorageID());
 Uninterruptibles.joinUninterruptibly(scanner, 5, TimeUnit.MINUTES);
}