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A common base library for Apache Accumulo servers.
/*
* 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.accumulo.server.fs;
import static java.util.Objects.requireNonNull;
import java.io.IOException;
import java.net.URI;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.accumulo.core.conf.AccumuloConfiguration;
import org.apache.accumulo.core.conf.DefaultConfiguration;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.conf.SiteConfiguration;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.impl.KeyExtent;
import org.apache.accumulo.core.file.rfile.RFile;
import org.apache.accumulo.core.util.CachedConfiguration;
import org.apache.accumulo.core.volume.NonConfiguredVolume;
import org.apache.accumulo.core.volume.Volume;
import org.apache.accumulo.core.volume.VolumeConfiguration;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.NotImplementedException;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.Trash;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Optional;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
public class VolumeManagerImpl implements VolumeManager {
private static final Logger log = LoggerFactory.getLogger(VolumeManagerImpl.class);
private static final HashSet WARNED_ABOUT_SYNCONCLOSE = new HashSet();
Map volumesByName;
Multimap volumesByFileSystemUri;
Volume defaultVolume;
AccumuloConfiguration conf;
VolumeChooser chooser;
protected VolumeManagerImpl(Map volumes, Volume defaultVolume, AccumuloConfiguration conf) {
this.volumesByName = volumes;
this.defaultVolume = defaultVolume;
// We may have multiple directories used in a single FileSystem (e.g. testing)
this.volumesByFileSystemUri = HashMultimap.create();
invertVolumesByFileSystem(volumesByName, volumesByFileSystemUri);
this.conf = conf;
ensureSyncIsEnabled();
// Keep in sync with default type in the property definition.
chooser = Property.createInstanceFromPropertyName(conf, Property.GENERAL_VOLUME_CHOOSER, VolumeChooser.class, new PerTableVolumeChooser());
}
private void invertVolumesByFileSystem(Map forward, Multimap inverted) {
for (Volume volume : forward.values()) {
inverted.put(volume.getFileSystem().getUri(), volume);
}
}
public static org.apache.accumulo.server.fs.VolumeManager getLocal(String localBasePath) throws IOException {
AccumuloConfiguration accConf = DefaultConfiguration.getDefaultConfiguration();
Volume defaultLocalVolume = VolumeConfiguration.create(FileSystem.getLocal(CachedConfiguration.getInstance()), localBasePath);
// The default volume gets placed in the map, but local filesystem is only used for testing purposes
return new VolumeManagerImpl(Collections.singletonMap(DEFAULT, defaultLocalVolume), defaultLocalVolume, accConf);
}
@Override
public void close() throws IOException {
IOException ex = null;
for (Volume volume : volumesByName.values()) {
try {
volume.getFileSystem().close();
} catch (IOException e) {
ex = e;
}
}
if (ex != null) {
throw ex;
}
}
@Override
public FSDataOutputStream create(Path path) throws IOException {
requireNonNull(path);
Volume v = getVolumeByPath(path);
return v.getFileSystem().create(path);
}
@Override
public FSDataOutputStream create(Path path, boolean overwrite) throws IOException {
requireNonNull(path);
Volume v = getVolumeByPath(path);
return v.getFileSystem().create(path, overwrite);
}
private static long correctBlockSize(Configuration conf, long blockSize) {
if (blockSize <= 0)
blockSize = conf.getLong("dfs.block.size", 67108864);
int checkSum = conf.getInt("io.bytes.per.checksum", 512);
blockSize -= blockSize % checkSum;
blockSize = Math.max(blockSize, checkSum);
return blockSize;
}
private static int correctBufferSize(Configuration conf, int bufferSize) {
if (bufferSize <= 0)
bufferSize = conf.getInt("io.file.buffer.size", 4096);
return bufferSize;
}
@Override
public FSDataOutputStream create(Path path, boolean overwrite, int bufferSize, short replication, long blockSize) throws IOException {
requireNonNull(path);
Volume v = getVolumeByPath(path);
FileSystem fs = v.getFileSystem();
blockSize = correctBlockSize(fs.getConf(), blockSize);
bufferSize = correctBufferSize(fs.getConf(), bufferSize);
return fs.create(path, overwrite, bufferSize, replication, blockSize);
}
@Override
public boolean createNewFile(Path path) throws IOException {
requireNonNull(path);
Volume v = getVolumeByPath(path);
return v.getFileSystem().createNewFile(path);
}
@Override
public FSDataOutputStream createSyncable(Path logPath, int bufferSize, short replication, long blockSize) throws IOException {
Volume v = getVolumeByPath(logPath);
FileSystem fs = v.getFileSystem();
blockSize = correctBlockSize(fs.getConf(), blockSize);
bufferSize = correctBufferSize(fs.getConf(), bufferSize);
EnumSet set = EnumSet.of(CreateFlag.SYNC_BLOCK, CreateFlag.CREATE);
log.debug("creating " + logPath + " with CreateFlag set: " + set);
try {
return fs.create(logPath, FsPermission.getDefault(), set, bufferSize, replication, blockSize, null);
} catch (Exception ex) {
log.debug("Exception", ex);
return fs.create(logPath, true, bufferSize, replication, blockSize);
}
}
@Override
public boolean delete(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().delete(path, false);
}
@Override
public boolean deleteRecursively(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().delete(path, true);
}
protected void ensureSyncIsEnabled() {
for (Entry entry : getFileSystems().entrySet()) {
FileSystem fs = entry.getValue().getFileSystem();
if (fs instanceof DistributedFileSystem) {
// Avoid use of DFSConfigKeys since it's private
final String DFS_SUPPORT_APPEND = "dfs.support.append", DFS_DATANODE_SYNCONCLOSE = "dfs.datanode.synconclose";
final String ticketMessage = "See ACCUMULO-623 and ACCUMULO-1637 for more details.";
// If either of these parameters are configured to be false, fail.
// This is a sign that someone is writing bad configuration.
if (!fs.getConf().getBoolean(DFS_SUPPORT_APPEND, true)) {
String msg = "Accumulo requires that " + DFS_SUPPORT_APPEND + " not be configured as false. " + ticketMessage;
// ACCUMULO-3651 Changed level to error and added FATAL to message for slf4j compatibility
log.error("FATAL {}", msg);
throw new RuntimeException(msg);
}
// Warn if synconclose isn't set
if (!fs.getConf().getBoolean(DFS_DATANODE_SYNCONCLOSE, false)) {
// Only warn once per process per volume URI
synchronized (WARNED_ABOUT_SYNCONCLOSE) {
if (!WARNED_ABOUT_SYNCONCLOSE.contains(entry.getKey())) {
WARNED_ABOUT_SYNCONCLOSE.add(entry.getKey());
log.warn(DFS_DATANODE_SYNCONCLOSE + " set to false in hdfs-site.xml: data loss is possible on hard system reset or power loss");
}
}
}
}
}
}
@Override
public boolean exists(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().exists(path);
}
@Override
public FileStatus getFileStatus(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().getFileStatus(path);
}
@Override
public Volume getVolumeByPath(Path path) {
if (path.toString().contains(":")) {
try {
FileSystem desiredFs = path.getFileSystem(CachedConfiguration.getInstance());
URI desiredFsUri = desiredFs.getUri();
Collection candidateVolumes = volumesByFileSystemUri.get(desiredFsUri);
if (null != candidateVolumes) {
for (Volume candidateVolume : candidateVolumes) {
if (candidateVolume.isValidPath(path)) {
return candidateVolume;
}
}
// For the same reason as we can have multiple Volumes within a single filesystem
// we could also not find a matching one. We should still provide a Volume with the
// correct FileSystem even though we don't know what the proper base dir is
// e.g. Files on volumes that are now removed
log.debug("Found candidate Volumes for Path but none of the Volumes are valid for the candidates: " + path);
} else {
log.debug("Could not determine volume for Path: " + path);
}
return new NonConfiguredVolume(desiredFs);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
return defaultVolume;
}
private Map getFileSystems() {
return volumesByName;
}
@Override
public FileStatus[] listStatus(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().listStatus(path);
}
@Override
public boolean mkdirs(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().mkdirs(path);
}
@Override
public FSDataInputStream open(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().open(path);
}
@Override
public boolean rename(Path path, Path newPath) throws IOException {
Volume srcVolume = getVolumeByPath(path);
Volume destVolume = getVolumeByPath(newPath);
FileSystem source = srcVolume.getFileSystem();
FileSystem dest = destVolume.getFileSystem();
if (source != dest) {
throw new NotImplementedException("Cannot rename files across volumes: " + path + " -> " + newPath);
}
return source.rename(path, newPath);
}
@Override
public boolean moveToTrash(Path path) throws IOException {
FileSystem fs = getVolumeByPath(path).getFileSystem();
Trash trash = new Trash(fs, fs.getConf());
return trash.moveToTrash(path);
}
@Override
public short getDefaultReplication(Path path) {
Volume v = getVolumeByPath(path);
return v.getFileSystem().getDefaultReplication(path);
}
@Override
public boolean isFile(Path path) throws IOException {
return getVolumeByPath(path).getFileSystem().isFile(path);
}
public static VolumeManager get() throws IOException {
AccumuloConfiguration conf = SiteConfiguration.getInstance();
return get(conf);
}
static private final String DEFAULT = "";
public static VolumeManager get(AccumuloConfiguration conf) throws IOException {
return get(conf, CachedConfiguration.getInstance());
}
public static VolumeManager get(AccumuloConfiguration conf, final Configuration hadoopConf) throws IOException {
final Map volumes = new HashMap();
// The "default" Volume for Accumulo (in case no volumes are specified)
for (String volumeUriOrDir : VolumeConfiguration.getVolumeUris(conf, hadoopConf)) {
if (volumeUriOrDir.equals(DEFAULT))
throw new IllegalArgumentException("Cannot re-define the default volume");
if (volumeUriOrDir.startsWith("viewfs"))
throw new IllegalArgumentException("Cannot use viewfs as a volume");
// We require a URI here, fail if it doesn't look like one
if (volumeUriOrDir.contains(":")) {
volumes.put(volumeUriOrDir, VolumeConfiguration.create(new Path(volumeUriOrDir), hadoopConf));
} else {
throw new IllegalArgumentException("Expected fully qualified URI for " + Property.INSTANCE_VOLUMES.getKey() + " got " + volumeUriOrDir);
}
}
return new VolumeManagerImpl(volumes, VolumeConfiguration.getDefaultVolume(hadoopConf, conf), conf);
}
@Override
public boolean isReady() throws IOException {
for (Volume volume : getFileSystems().values()) {
final FileSystem fs = volume.getFileSystem();
if (!(fs instanceof DistributedFileSystem))
continue;
final DistributedFileSystem dfs = (DistributedFileSystem) fs;
// Returns true when safemode is on
if (dfs.setSafeMode(SafeModeAction.SAFEMODE_GET)) {
return false;
}
}
return true;
}
@Override
public FileStatus[] globStatus(Path pathPattern) throws IOException {
return getVolumeByPath(pathPattern).getFileSystem().globStatus(pathPattern);
}
@Override
public Path getFullPath(Key key) {
// TODO sanity check col fam
String relPath = key.getColumnQualifierData().toString();
byte[] tableId = KeyExtent.tableOfMetadataRow(key.getRow());
return getFullPath(new String(tableId), relPath);
}
@Override
public Path matchingFileSystem(Path source, String[] options) {
try {
if (ViewFSUtils.isViewFS(source, CachedConfiguration.getInstance())) {
return ViewFSUtils.matchingFileSystem(source, options, CachedConfiguration.getInstance());
}
} catch (IOException e) {
throw new RuntimeException(e);
}
URI uri1 = source.toUri();
for (String option : options) {
URI uri3 = URI.create(option);
if (uri1.getScheme().equals(uri3.getScheme())) {
String a1 = uri1.getAuthority();
String a2 = uri3.getAuthority();
if ((a1 == null && a2 == null) || (a1 != null && a1.equals(a2)))
return new Path(option);
}
}
return null;
}
@Override
public Path getFullPath(String tableId, String path) {
if (path.contains(":"))
return new Path(path);
if (path.startsWith("../"))
path = path.substring(2);
else if (path.startsWith("/"))
path = "/" + tableId + path;
else
throw new IllegalArgumentException("Unexpected path prefix " + path);
return getFullPath(FileType.TABLE, path);
}
private static final String RFILE_SUFFIX = "." + RFile.EXTENSION;
@Override
public Path getFullPath(FileType fileType, String path) {
int colon = path.indexOf(':');
if (colon > -1) {
// Check if this is really an absolute path or if this is a 1.4 style relative path for a WAL
if (fileType == FileType.WAL && path.charAt(colon + 1) != '/') {
path = path.substring(path.indexOf('/'));
} else {
return new Path(path);
}
}
if (path.startsWith("/"))
path = path.substring(1);
// ACCUMULO-2974 To ensure that a proper absolute path is created, the caller needs to include the table ID
// in the relative path. Fail when this doesn't appear to happen.
if (FileType.TABLE == fileType) {
// Trailing slash doesn't create an additional element
String[] pathComponents = StringUtils.split(path, Path.SEPARATOR_CHAR);
// Is an rfile
if (path.endsWith(RFILE_SUFFIX)) {
if (pathComponents.length < 3) {
throw new IllegalArgumentException("Fewer components in file path than expected");
}
} else {
// is a directory
if (pathComponents.length < 2) {
throw new IllegalArgumentException("Fewer components in directory path than expected");
}
}
}
// normalize the path
Path fullPath = new Path(defaultVolume.getBasePath(), fileType.getDirectory());
fullPath = new Path(fullPath, path);
FileSystem fs = getVolumeByPath(fullPath).getFileSystem();
return fs.makeQualified(fullPath);
}
@Override
public ContentSummary getContentSummary(Path dir) throws IOException {
return getVolumeByPath(dir).getFileSystem().getContentSummary(dir);
}
// Only used as a fall back if the configured chooser misbehaves.
private final VolumeChooser failsafeChooser = new RandomVolumeChooser();
@Override
public String choose(Optional tableId, String[] options) {
final VolumeChooserEnvironment env = new VolumeChooserEnvironment(tableId);
final String choice = chooser.choose(env, options);
if (!(ArrayUtils.contains(options, choice))) {
log.error("The configured volume chooser, '" + chooser.getClass() + "', or one of its delegates returned a volume not in the set of options provided; "
+ "will continue by relying on a RandomVolumeChooser. You should investigate and correct the named chooser.");
return failsafeChooser.choose(env, options);
}
return choice;
}
@Override
public Volume getDefaultVolume() {
return defaultVolume;
}
@Override
public Collection getVolumes() {
return volumesByName.values();
}
}
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