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Apache Hadoop Distributed Copy
/**
* 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.tools;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.tools.util.DistCpUtils;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
/**
* The Options class encapsulates all DistCp options.
* These may be set from command-line (via the OptionsParser)
* or may be set manually.
*/
public class DistCpOptions {
private boolean atomicCommit = false;
private boolean syncFolder = false;
private boolean deleteMissing = false;
private boolean ignoreFailures = false;
private boolean overwrite = false;
private boolean append = false;
private boolean skipCRC = false;
private boolean blocking = true;
private boolean useDiff = false;
private int maxMaps = DistCpConstants.DEFAULT_MAPS;
private int mapBandwidth = DistCpConstants.DEFAULT_BANDWIDTH_MB;
private String sslConfigurationFile;
private String copyStrategy = DistCpConstants.UNIFORMSIZE;
private EnumSet preserveStatus = EnumSet.noneOf(FileAttribute.class);
private boolean preserveRawXattrs;
private Path atomicWorkPath;
private Path logPath;
private Path sourceFileListing;
private List sourcePaths;
private String fromSnapshot;
private String toSnapshot;
private Path targetPath;
// targetPathExist is a derived field, it's initialized in the
// beginning of distcp.
private boolean targetPathExists = true;
public static enum FileAttribute{
REPLICATION, BLOCKSIZE, USER, GROUP, PERMISSION, CHECKSUMTYPE, ACL, XATTR, TIMES;
public static FileAttribute getAttribute(char symbol) {
for (FileAttribute attribute : values()) {
if (attribute.name().charAt(0) == Character.toUpperCase(symbol)) {
return attribute;
}
}
throw new NoSuchElementException("No attribute for " + symbol);
}
}
/**
* Constructor, to initialize source/target paths.
* @param sourcePaths List of source-paths (including wildcards)
* to be copied to target.
* @param targetPath Destination path for the dist-copy.
*/
public DistCpOptions(List sourcePaths, Path targetPath) {
assert sourcePaths != null && !sourcePaths.isEmpty() : "Invalid source paths";
assert targetPath != null : "Invalid Target path";
this.sourcePaths = sourcePaths;
this.targetPath = targetPath;
}
/**
* Constructor, to initialize source/target paths.
* @param sourceFileListing File containing list of source paths
* @param targetPath Destination path for the dist-copy.
*/
public DistCpOptions(Path sourceFileListing, Path targetPath) {
assert sourceFileListing != null : "Invalid source paths";
assert targetPath != null : "Invalid Target path";
this.sourceFileListing = sourceFileListing;
this.targetPath = targetPath;
}
/**
* Copy constructor.
* @param that DistCpOptions being copied from.
*/
public DistCpOptions(DistCpOptions that) {
if (this != that && that != null) {
this.atomicCommit = that.atomicCommit;
this.syncFolder = that.syncFolder;
this.deleteMissing = that.deleteMissing;
this.ignoreFailures = that.ignoreFailures;
this.overwrite = that.overwrite;
this.skipCRC = that.skipCRC;
this.blocking = that.blocking;
this.maxMaps = that.maxMaps;
this.mapBandwidth = that.mapBandwidth;
this.sslConfigurationFile = that.getSslConfigurationFile();
this.copyStrategy = that.copyStrategy;
this.preserveStatus = that.preserveStatus;
this.preserveRawXattrs = that.preserveRawXattrs;
this.atomicWorkPath = that.getAtomicWorkPath();
this.logPath = that.getLogPath();
this.sourceFileListing = that.getSourceFileListing();
this.sourcePaths = that.getSourcePaths();
this.targetPath = that.getTargetPath();
this.targetPathExists = that.getTargetPathExists();
}
}
/**
* Should the data be committed atomically?
*
* @return true if data should be committed automically. false otherwise
*/
public boolean shouldAtomicCommit() {
return atomicCommit;
}
/**
* Set if data need to be committed automatically
*
* @param atomicCommit - boolean switch
*/
public void setAtomicCommit(boolean atomicCommit) {
validate(DistCpOptionSwitch.ATOMIC_COMMIT, atomicCommit);
this.atomicCommit = atomicCommit;
}
/**
* Should the data be sync'ed between source and target paths?
*
* @return true if data should be sync'ed up. false otherwise
*/
public boolean shouldSyncFolder() {
return syncFolder;
}
/**
* Set if source and target folder contents be sync'ed up
*
* @param syncFolder - boolean switch
*/
public void setSyncFolder(boolean syncFolder) {
validate(DistCpOptionSwitch.SYNC_FOLDERS, syncFolder);
this.syncFolder = syncFolder;
}
/**
* Should target files missing in source should be deleted?
*
* @return true if zoombie target files to be removed. false otherwise
*/
public boolean shouldDeleteMissing() {
return deleteMissing;
}
/**
* Set if files only present in target should be deleted
*
* @param deleteMissing - boolean switch
*/
public void setDeleteMissing(boolean deleteMissing) {
validate(DistCpOptionSwitch.DELETE_MISSING, deleteMissing);
this.deleteMissing = deleteMissing;
}
/**
* Should failures be logged and ignored during copy?
*
* @return true if failures are to be logged and ignored. false otherwise
*/
public boolean shouldIgnoreFailures() {
return ignoreFailures;
}
/**
* Set if failures during copy be ignored
*
* @param ignoreFailures - boolean switch
*/
public void setIgnoreFailures(boolean ignoreFailures) {
this.ignoreFailures = ignoreFailures;
}
/**
* Should DistCp be running in blocking mode
*
* @return true if should run in blocking, false otherwise
*/
public boolean shouldBlock() {
return blocking;
}
/**
* Set if Disctp should run blocking or non-blocking
*
* @param blocking - boolean switch
*/
public void setBlocking(boolean blocking) {
this.blocking = blocking;
}
/**
* Should files be overwritten always?
*
* @return true if files in target that may exist before distcp, should always
* be overwritten. false otherwise
*/
public boolean shouldOverwrite() {
return overwrite;
}
/**
* Set if files should always be overwritten on target
*
* @param overwrite - boolean switch
*/
public void setOverwrite(boolean overwrite) {
validate(DistCpOptionSwitch.OVERWRITE, overwrite);
this.overwrite = overwrite;
}
/**
* @return whether we can append new data to target files
*/
public boolean shouldAppend() {
return append;
}
/**
* Set if we want to append new data to target files. This is valid only with
* update option and CRC is not skipped.
*/
public void setAppend(boolean append) {
validate(DistCpOptionSwitch.APPEND, append);
this.append = append;
}
public boolean shouldUseDiff() {
return this.useDiff;
}
public String getFromSnapshot() {
return this.fromSnapshot;
}
public String getToSnapshot() {
return this.toSnapshot;
}
public void setUseDiff(boolean useDiff, String fromSnapshot, String toSnapshot) {
validate(DistCpOptionSwitch.DIFF, useDiff);
this.useDiff = useDiff;
this.fromSnapshot = fromSnapshot;
this.toSnapshot = toSnapshot;
}
public void disableUsingDiff() {
this.useDiff = false;
}
/**
* Should CRC/checksum check be skipped while checking files are identical
*
* @return true if checksum check should be skipped while checking files are
* identical. false otherwise
*/
public boolean shouldSkipCRC() {
return skipCRC;
}
/**
* Set if checksum comparison should be skipped while determining if
* source and destination files are identical
*
* @param skipCRC - boolean switch
*/
public void setSkipCRC(boolean skipCRC) {
validate(DistCpOptionSwitch.SKIP_CRC, skipCRC);
this.skipCRC = skipCRC;
}
/** Get the max number of maps to use for this copy
*
* @return Max number of maps
*/
public int getMaxMaps() {
return maxMaps;
}
/**
* Set the max number of maps to use for copy
*
* @param maxMaps - Number of maps
*/
public void setMaxMaps(int maxMaps) {
this.maxMaps = Math.max(maxMaps, 1);
}
/** Get the map bandwidth in MB
*
* @return Bandwidth in MB
*/
public int getMapBandwidth() {
return mapBandwidth;
}
/**
* Set per map bandwidth
*
* @param mapBandwidth - per map bandwidth
*/
public void setMapBandwidth(int mapBandwidth) {
assert mapBandwidth > 0 : "Bandwidth " + mapBandwidth + " is invalid (should be > 0)";
this.mapBandwidth = mapBandwidth;
}
/**
* Get path where the ssl configuration file is present to use for hftps://
*
* @return Path on local file system
*/
public String getSslConfigurationFile() {
return sslConfigurationFile;
}
/**
* Set the SSL configuration file path to use with hftps:// (local path)
*
* @param sslConfigurationFile - Local ssl config file path
*/
public void setSslConfigurationFile(String sslConfigurationFile) {
this.sslConfigurationFile = sslConfigurationFile;
}
/**
* Returns an iterator with the list of file attributes to preserve
*
* @return iterator of file attributes to preserve
*/
public Iterator preserveAttributes() {
return preserveStatus.iterator();
}
/**
* Checks if the input attribute should be preserved or not
*
* @param attribute - Attribute to check
* @return True if attribute should be preserved, false otherwise
*/
public boolean shouldPreserve(FileAttribute attribute) {
return preserveStatus.contains(attribute);
}
/**
* Add file attributes that need to be preserved. This method may be
* called multiple times to add attributes.
*
* @param fileAttribute - Attribute to add, one at a time
*/
public void preserve(FileAttribute fileAttribute) {
for (FileAttribute attribute : preserveStatus) {
if (attribute.equals(fileAttribute)) {
return;
}
}
preserveStatus.add(fileAttribute);
}
/**
* Return true if raw.* xattrs should be preserved.
* @return true if raw.* xattrs should be preserved.
*/
public boolean shouldPreserveRawXattrs() {
return preserveRawXattrs;
}
/**
* Indicate that raw.* xattrs should be preserved
*/
public void preserveRawXattrs() {
preserveRawXattrs = true;
}
/** Get work path for atomic commit. If null, the work
* path would be parentOf(targetPath) + "/._WIP_" + nameOf(targetPath)
*
* @return Atomic work path on the target cluster. Null if not set
*/
public Path getAtomicWorkPath() {
return atomicWorkPath;
}
/**
* Set the work path for atomic commit
*
* @param atomicWorkPath - Path on the target cluster
*/
public void setAtomicWorkPath(Path atomicWorkPath) {
this.atomicWorkPath = atomicWorkPath;
}
/** Get output directory for writing distcp logs. Otherwise logs
* are temporarily written to JobStagingDir/_logs and deleted
* upon job completion
*
* @return Log output path on the cluster where distcp job is run
*/
public Path getLogPath() {
return logPath;
}
/**
* Set the log path where distcp output logs are stored
* Uses JobStagingDir/_logs by default
*
* @param logPath - Path where logs will be saved
*/
public void setLogPath(Path logPath) {
this.logPath = logPath;
}
/**
* Get the copy strategy to use. Uses appropriate input format
*
* @return copy strategy to use
*/
public String getCopyStrategy() {
return copyStrategy;
}
/**
* Set the copy strategy to use. Should map to a strategy implementation
* in distp-default.xml
*
* @param copyStrategy - copy Strategy to use
*/
public void setCopyStrategy(String copyStrategy) {
this.copyStrategy = copyStrategy;
}
/**
* File path (hdfs:// or file://) that contains the list of actual
* files to copy
*
* @return - Source listing file path
*/
public Path getSourceFileListing() {
return sourceFileListing;
}
/**
* Getter for sourcePaths.
* @return List of source-paths.
*/
public List getSourcePaths() {
return sourcePaths;
}
/**
* Setter for sourcePaths.
* @param sourcePaths The new list of source-paths.
*/
public void setSourcePaths(List sourcePaths) {
assert sourcePaths != null && sourcePaths.size() != 0;
this.sourcePaths = sourcePaths;
}
/**
* Getter for the targetPath.
* @return The target-path.
*/
public Path getTargetPath() {
return targetPath;
}
/**
* Getter for the targetPathExists.
* @return The target-path.
*/
public boolean getTargetPathExists() {
return targetPathExists;
}
/**
* Set targetPathExists.
* @param targetPathExists Whether the target path of distcp exists.
*/
public boolean setTargetPathExists(boolean targetPathExists) {
return this.targetPathExists = targetPathExists;
}
public void validate(DistCpOptionSwitch option, boolean value) {
boolean syncFolder = (option == DistCpOptionSwitch.SYNC_FOLDERS ?
value : this.syncFolder);
boolean overwrite = (option == DistCpOptionSwitch.OVERWRITE ?
value : this.overwrite);
boolean deleteMissing = (option == DistCpOptionSwitch.DELETE_MISSING ?
value : this.deleteMissing);
boolean atomicCommit = (option == DistCpOptionSwitch.ATOMIC_COMMIT ?
value : this.atomicCommit);
boolean skipCRC = (option == DistCpOptionSwitch.SKIP_CRC ?
value : this.skipCRC);
boolean append = (option == DistCpOptionSwitch.APPEND ? value : this.append);
boolean useDiff = (option == DistCpOptionSwitch.DIFF ? value : this.useDiff);
if (syncFolder && atomicCommit) {
throw new IllegalArgumentException("Atomic commit can't be used with " +
"sync folder or overwrite options");
}
if (deleteMissing && !(overwrite || syncFolder)) {
throw new IllegalArgumentException("Delete missing is applicable " +
"only with update or overwrite options");
}
if (overwrite && syncFolder) {
throw new IllegalArgumentException("Overwrite and update options are " +
"mutually exclusive");
}
if (!syncFolder && skipCRC) {
throw new IllegalArgumentException("Skip CRC is valid only with update options");
}
if (!syncFolder && append) {
throw new IllegalArgumentException(
"Append is valid only with update options");
}
if (skipCRC && append) {
throw new IllegalArgumentException(
"Append is disallowed when skipping CRC");
}
if ((!syncFolder || !deleteMissing) && useDiff) {
throw new IllegalArgumentException(
"Diff is valid only with update and delete options");
}
}
/**
* Add options to configuration. These will be used in the Mapper/committer
*
* @param conf - Configruation object to which the options need to be added
*/
public void appendToConf(Configuration conf) {
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.ATOMIC_COMMIT,
String.valueOf(atomicCommit));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.IGNORE_FAILURES,
String.valueOf(ignoreFailures));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.SYNC_FOLDERS,
String.valueOf(syncFolder));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.DELETE_MISSING,
String.valueOf(deleteMissing));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.OVERWRITE,
String.valueOf(overwrite));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.APPEND,
String.valueOf(append));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.DIFF,
String.valueOf(useDiff));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.SKIP_CRC,
String.valueOf(skipCRC));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.BANDWIDTH,
String.valueOf(mapBandwidth));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.PRESERVE_STATUS,
DistCpUtils.packAttributes(preserveStatus));
}
/**
* Utility to easily string-ify Options, for logging.
*
* @return String representation of the Options.
*/
@Override
public String toString() {
return "DistCpOptions{" +
"atomicCommit=" + atomicCommit +
", syncFolder=" + syncFolder +
", deleteMissing=" + deleteMissing +
", ignoreFailures=" + ignoreFailures +
", maxMaps=" + maxMaps +
", sslConfigurationFile='" + sslConfigurationFile + '\'' +
", copyStrategy='" + copyStrategy + '\'' +
", sourceFileListing=" + sourceFileListing +
", sourcePaths=" + sourcePaths +
", targetPath=" + targetPath +
", targetPathExists=" + targetPathExists +
", preserveRawXattrs=" + preserveRawXattrs +
'}';
}
@Override
protected DistCpOptions clone() throws CloneNotSupportedException {
return (DistCpOptions) super.clone();
}
}