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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
import java.io.IOException;
import java.nio.channels.ClosedChannelException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.VolumeChoosingPolicy;
import org.apache.hadoop.hdfs.server.datanode.BlockScanner;
import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.AutoCloseableLock;
import org.apache.hadoop.util.Time;
class FsVolumeList {
private final CopyOnWriteArrayList volumes =
new CopyOnWriteArrayList<>();
// Tracks volume failures, sorted by volume path.
// map from volume storageID to the volume failure info
private final Map volumeFailureInfos =
Collections.synchronizedMap(
new TreeMap());
private final ConcurrentLinkedQueue volumesBeingRemoved =
new ConcurrentLinkedQueue<>();
private final AutoCloseableLock checkDirsLock;
private final Condition checkDirsLockCondition;
private final VolumeChoosingPolicy blockChooser;
private final BlockScanner blockScanner;
FsVolumeList(List initialVolumeFailureInfos,
BlockScanner blockScanner,
VolumeChoosingPolicy blockChooser) {
this.blockChooser = blockChooser;
this.blockScanner = blockScanner;
this.checkDirsLock = new AutoCloseableLock();
this.checkDirsLockCondition = checkDirsLock.newCondition();
for (VolumeFailureInfo volumeFailureInfo: initialVolumeFailureInfos) {
volumeFailureInfos.put(volumeFailureInfo.getFailedStorageLocation(),
volumeFailureInfo);
}
}
/**
* Return an immutable list view of all the volumes.
*/
List getVolumes() {
return Collections.unmodifiableList(volumes);
}
private FsVolumeReference chooseVolume(List list,
long blockSize, String storageId) throws IOException {
while (true) {
FsVolumeImpl volume = blockChooser.chooseVolume(list, blockSize,
storageId);
try {
return volume.obtainReference();
} catch (ClosedChannelException e) {
FsDatasetImpl.LOG.warn("Chosen a closed volume: " + volume);
// blockChooser.chooseVolume returns DiskOutOfSpaceException when the list
// is empty, indicating that all volumes are closed.
list.remove(volume);
}
}
}
/**
* Get next volume.
*
* @param blockSize free space needed on the volume
* @param storageType the desired {@link StorageType}
* @param storageId the storage id which may or may not be used by
* the VolumeChoosingPolicy.
* @return next volume to store the block in.
*/
FsVolumeReference getNextVolume(StorageType storageType, String storageId,
long blockSize) throws IOException {
final List list = new ArrayList<>(volumes.size());
for(FsVolumeImpl v : volumes) {
if (v.getStorageType() == storageType) {
list.add(v);
}
}
return chooseVolume(list, blockSize, storageId);
}
/**
* Get next volume.
*
* @param blockSize free space needed on the volume
* @return next volume to store the block in.
*/
FsVolumeReference getNextTransientVolume(long blockSize) throws IOException {
// Get a snapshot of currently available volumes.
final List curVolumes = getVolumes();
final List list = new ArrayList<>(curVolumes.size());
for(FsVolumeImpl v : curVolumes) {
if (v.isTransientStorage()) {
list.add(v);
}
}
return chooseVolume(list, blockSize, null);
}
long getDfsUsed() throws IOException {
long dfsUsed = 0L;
for (FsVolumeImpl v : volumes) {
try(FsVolumeReference ref = v.obtainReference()) {
dfsUsed += v.getDfsUsed();
} catch (ClosedChannelException e) {
// ignore.
}
}
return dfsUsed;
}
long getBlockPoolUsed(String bpid) throws IOException {
long dfsUsed = 0L;
for (FsVolumeImpl v : volumes) {
try (FsVolumeReference ref = v.obtainReference()) {
dfsUsed += v.getBlockPoolUsed(bpid);
} catch (ClosedChannelException e) {
// ignore.
}
}
return dfsUsed;
}
long getCapacity() {
long capacity = 0L;
for (FsVolumeImpl v : volumes) {
try (FsVolumeReference ref = v.obtainReference()) {
capacity += v.getCapacity();
} catch (IOException e) {
// ignore.
}
}
return capacity;
}
long getRemaining() throws IOException {
long remaining = 0L;
for (FsVolumeSpi vol : volumes) {
try (FsVolumeReference ref = vol.obtainReference()) {
remaining += vol.getAvailable();
} catch (ClosedChannelException e) {
// ignore
}
}
return remaining;
}
void getAllVolumesMap(final String bpid,
final ReplicaMap volumeMap,
final RamDiskReplicaTracker ramDiskReplicaMap)
throws IOException {
long totalStartTime = Time.monotonicNow();
final Map unhealthyDataDirs =
new ConcurrentHashMap();
List replicaAddingThreads = new ArrayList();
for (final FsVolumeImpl v : volumes) {
Thread t = new Thread() {
public void run() {
try (FsVolumeReference ref = v.obtainReference()) {
FsDatasetImpl.LOG.info("Adding replicas to map for block pool " +
bpid + " on volume " + v + "...");
long startTime = Time.monotonicNow();
v.getVolumeMap(bpid, volumeMap, ramDiskReplicaMap);
long timeTaken = Time.monotonicNow() - startTime;
FsDatasetImpl.LOG.info("Time to add replicas to map for block pool"
+ " " + bpid + " on volume " + v + ": " + timeTaken + "ms");
} catch (IOException ioe) {
FsDatasetImpl.LOG.info("Caught exception while adding replicas " +
"from " + v + ". Will throw later.", ioe);
unhealthyDataDirs.put(v, ioe);
}
}
};
replicaAddingThreads.add(t);
t.start();
}
for (Thread t : replicaAddingThreads) {
try {
t.join();
} catch (InterruptedException ie) {
throw new IOException(ie);
}
}
long totalTimeTaken = Time.monotonicNow() - totalStartTime;
FsDatasetImpl.LOG
.info("Total time to add all replicas to map for block pool " + bpid
+ ": " + totalTimeTaken + "ms");
if (!unhealthyDataDirs.isEmpty()) {
throw new AddBlockPoolException(unhealthyDataDirs);
}
}
/**
* Updates the failed volume info in the volumeFailureInfos Map
* and calls {@link #removeVolume(FsVolumeImpl)} to remove the volume
* from the volume list for each of the failed volumes.
*
* @param failedVolumes set of volumes marked failed.
*/
void handleVolumeFailures(Set failedVolumes) {
try (AutoCloseableLock lock = checkDirsLock.acquire()) {
for(FsVolumeSpi vol : failedVolumes) {
FsVolumeImpl fsv = (FsVolumeImpl) vol;
try (FsVolumeReference ref = fsv.obtainReference()) {
addVolumeFailureInfo(fsv);
removeVolume(fsv);
} catch (ClosedChannelException e) {
FsDatasetImpl.LOG.debug("Caught exception when obtaining " +
"reference count on closed volume", e);
} catch (IOException e) {
FsDatasetImpl.LOG.error("Unexpected IOException", e);
}
}
waitVolumeRemoved(5000, checkDirsLockCondition);
}
}
/**
* Wait for the reference of the volume removed from a previous
* {@link #removeVolume(FsVolumeImpl)} call to be released.
*
* @param sleepMillis interval to recheck.
*/
void waitVolumeRemoved(int sleepMillis, Condition condition) {
while (!checkVolumesRemoved()) {
if (FsDatasetImpl.LOG.isDebugEnabled()) {
FsDatasetImpl.LOG.debug("Waiting for volume reference to be released.");
}
try {
condition.await(sleepMillis, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
FsDatasetImpl.LOG.info("Thread interrupted when waiting for "
+ "volume reference to be released.");
Thread.currentThread().interrupt();
}
}
FsDatasetImpl.LOG.info("Volume reference is released.");
}
@Override
public String toString() {
return volumes.toString();
}
/**
* Dynamically add new volumes to the existing volumes that this DN manages.
*
* @param ref a reference to the new FsVolumeImpl instance.
*/
void addVolume(FsVolumeReference ref) {
FsVolumeImpl volume = (FsVolumeImpl) ref.getVolume();
volumes.add(volume);
if (blockScanner != null) {
blockScanner.addVolumeScanner(ref);
} else {
// If the volume is not put into a volume scanner, it does not need to
// hold the reference.
IOUtils.cleanup(null, ref);
}
// If the volume is used to replace a failed volume, it needs to reset the
// volume failure info for this volume.
removeVolumeFailureInfo(volume.getStorageLocation());
FsDatasetImpl.LOG.info("Added new volume: " +
volume.getStorageID());
}
/**
* 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.");
}
}
}
/**
* Dynamically remove volume in the list.
* @param storageLocation {@link StorageLocation} of the volume to be removed.
* @param clearFailure set true to remove failure info for this volume.
*/
void removeVolume(StorageLocation storageLocation, boolean clearFailure) {
for (FsVolumeImpl fsVolume : volumes) {
StorageLocation baseLocation = fsVolume.getStorageLocation();
if (baseLocation.equals(storageLocation)) {
removeVolume(fsVolume);
}
}
if (clearFailure) {
removeVolumeFailureInfo(storageLocation);
}
}
VolumeFailureInfo[] getVolumeFailureInfos() {
Collection infos = volumeFailureInfos.values();
return infos.toArray(new VolumeFailureInfo[infos.size()]);
}
/**
* Check whether the reference of the volume from a previous
* {@link #removeVolume(FsVolumeImpl)} call is released.
*
* @return Whether the reference is released.
*/
boolean checkVolumesRemoved() {
Iterator it = volumesBeingRemoved.iterator();
while (it.hasNext()) {
FsVolumeImpl volume = it.next();
if (!volume.checkClosed()) {
return false;
}
it.remove();
}
return true;
}
void addVolumeFailureInfo(VolumeFailureInfo volumeFailureInfo) {
// There could be redundant requests for adding the same failed
// volume because of repeated DataNode reconfigure with same list
// of volumes. Ignoring update on failed volume so as to preserve
// old failed capacity details in the map.
if (!volumeFailureInfos.containsKey(volumeFailureInfo
.getFailedStorageLocation())) {
volumeFailureInfos.put(volumeFailureInfo.getFailedStorageLocation(),
volumeFailureInfo);
}
}
private void addVolumeFailureInfo(FsVolumeImpl vol) {
addVolumeFailureInfo(new VolumeFailureInfo(
vol.getStorageLocation(),
Time.now(),
vol.getCapacity()));
}
void removeVolumeFailureInfo(StorageLocation location) {
volumeFailureInfos.remove(location);
}
void addBlockPool(final String bpid, final Configuration conf) throws IOException {
long totalStartTime = Time.monotonicNow();
final Map unhealthyDataDirs =
new ConcurrentHashMap();
List blockPoolAddingThreads = new ArrayList();
for (final FsVolumeImpl v : volumes) {
Thread t = new Thread() {
public void run() {
try (FsVolumeReference ref = v.obtainReference()) {
FsDatasetImpl.LOG.info("Scanning block pool " + bpid +
" on volume " + v + "...");
long startTime = Time.monotonicNow();
v.addBlockPool(bpid, conf);
long timeTaken = Time.monotonicNow() - startTime;
FsDatasetImpl.LOG.info("Time taken to scan block pool " + bpid +
" on " + v + ": " + timeTaken + "ms");
} catch (IOException ioe) {
FsDatasetImpl.LOG.info("Caught exception while scanning " + v +
". Will throw later.", ioe);
unhealthyDataDirs.put(v, ioe);
}
}
};
blockPoolAddingThreads.add(t);
t.start();
}
for (Thread t : blockPoolAddingThreads) {
try {
t.join();
} catch (InterruptedException ie) {
throw new IOException(ie);
}
}
long totalTimeTaken = Time.monotonicNow() - totalStartTime;
FsDatasetImpl.LOG.info("Total time to scan all replicas for block pool " +
bpid + ": " + totalTimeTaken + "ms");
if (!unhealthyDataDirs.isEmpty()) {
throw new AddBlockPoolException(unhealthyDataDirs);
}
}
void removeBlockPool(String bpid, Map
blocksPerVolume) {
for (FsVolumeImpl v : volumes) {
v.shutdownBlockPool(bpid, blocksPerVolume.get(v.toDatanodeStorage()));
}
}
void shutdown() {
for (FsVolumeImpl volume : volumes) {
if(volume != null) {
volume.shutdown();
}
}
}
}
