How to use

removeVolumeScanner

method

in

org.apache.hadoop.hdfs.server.datanode.BlockScanner

/**
 * Dynamically remove a volume in the list.
 * @param target the volume instance to be removed.
 */
private void removeVolume(FsVolumeImpl target) {
 if (volumes.remove(target)) {
  if (blockScanner != null) {
   blockScanner.removeVolumeScanner(target);
  }
  try {
   target.setClosed();
  } catch (IOException e) {
   FsDatasetImpl.LOG.warn(
     "Error occurs when waiting volume to close: " + target, e);
  }
  target.shutdown();
  volumesBeingRemoved.add(target);
  FsDatasetImpl.LOG.info("Removed volume: " + target);
 } else {
  if (FsDatasetImpl.LOG.isDebugEnabled()) {
   FsDatasetImpl.LOG.debug("Volume " + target +
     " does not exist or is removed by others.");
  }
 }
}

 volumeList.toArray(new FsVolumeImpl[volumeList.size()]))) {
if (blockScanner != null) {
 blockScanner.removeVolumeScanner(target);

 volumeList.toArray(new FsVolumeImpl[volumeList.size()]))) {
if (blockScanner != null) {
 blockScanner.removeVolumeScanner(target);