How to use

close

method

in

org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference

@Override
public void close() throws IOException {
 if (this.volumeReference != null) {
  volumeReference.close();
 }
}

 @Override
 public void close() throws IOException {
  IOException ioe = null;
  for (FsVolumeReference ref : references) {
   try {
    ref.close();
   } catch (IOException e) {
    ioe = e;
   }
  }
  references.clear();
  if (ioe != null) {
   throw ioe;
  }
 }
}

/**
 * Moves a given block from one volume to another volume. This is used by disk
 * balancer.
 *
 * @param block       - ExtendedBlock
 * @param destination - Destination volume
 * @return Old replica info
 */
@Override
public ReplicaInfo moveBlockAcrossVolumes(ExtendedBlock block, FsVolumeSpi
  destination) throws IOException {
 ReplicaInfo replicaInfo = getReplicaInfo(block);
 if (replicaInfo.getState() != ReplicaState.FINALIZED) {
  throw new ReplicaNotFoundException(
    ReplicaNotFoundException.UNFINALIZED_REPLICA + block);
 }
 FsVolumeReference volumeRef = null;
 try (AutoCloseableLock lock = datasetLock.acquire()) {
  volumeRef = destination.obtainReference();
 }
 try {
  moveBlock(block, replicaInfo, volumeRef);
 } finally {
  if (volumeRef != null) {
   volumeRef.close();
  }
 }
 return replicaInfo;
}

@Override
public void close() throws IOException {
 if (this.volumeReference != null) {
  volumeReference.close();
 }
}

@Override
public void close() throws IOException {
 if (this.volumeReference != null) {
  volumeReference.close();
 }
}

} finally {
 if (volumeRef != null) {
  volumeRef.close();

@Test
public void testReleaseVolumeRefIfNoBlockScanner() throws IOException {
 FsVolumeList volumeList = new FsVolumeList(
   Collections.<VolumeFailureInfo>emptyList(), null, blockChooser);
 File volDir = new File(baseDir, "volume-0");
 volDir.mkdirs();
 FsVolumeImpl volume = new FsVolumeImpl(dataset, "storage-id", volDir,
   conf, StorageType.DEFAULT);
 FsVolumeReference ref = volume.obtainReference();
 volumeList.addVolume(ref);
 try {
  ref.close();
  fail("Should throw exception because the reference is closed in "
    + "VolumeList#addVolume().");
 } catch (IllegalStateException e) {
 }
}

} finally {
 if (volumeRef != null) {
  volumeRef.close();

} finally {
 if (volumeRef != null) {
  volumeRef.close();