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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.tools;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Path;
/**
* Utility class to hold commonly used constants.
*/
@InterfaceAudience.LimitedPrivate("Distcp support tools")
@InterfaceStability.Evolving
public final class DistCpConstants {
private DistCpConstants() {
}
/* Default number of threads to use for building file listing */
public static final int DEFAULT_LISTSTATUS_THREADS = 1;
/* Default number of maps to use for DistCp */
public static final int DEFAULT_MAPS = 20;
/* Default bandwidth if none specified */
public static final float DEFAULT_BANDWIDTH_MB = 100;
/* Default strategy for copying. Implementation looked up
from distcp-default.xml
*/
public static final String UNIFORMSIZE = "uniformsize";
/**
* Constants mapping to command line switches/input options
*/
public static final String CONF_LABEL_ATOMIC_COPY = "distcp.atomic.copy";
public static final String CONF_LABEL_WORK_PATH = "distcp.work.path";
public static final String CONF_LABEL_LOG_PATH = "distcp.log.path";
public static final String CONF_LABEL_VERBOSE_LOG = "distcp.verbose.log";
public static final String CONF_LABEL_IGNORE_FAILURES = "distcp.ignore.failures";
public static final String CONF_LABEL_PRESERVE_STATUS = "distcp.preserve.status";
public static final String CONF_LABEL_PRESERVE_RAWXATTRS =
"distcp.preserve.rawxattrs";
public static final String CONF_LABEL_SYNC_FOLDERS = "distcp.sync.folders";
public static final String CONF_LABEL_DELETE_MISSING = "distcp.delete.missing.source";
public static final String CONF_LABEL_TRACK_MISSING =
"distcp.track.missing.source";
public static final String CONF_LABEL_LISTSTATUS_THREADS = "distcp.liststatus.threads";
public static final String CONF_LABEL_MAX_MAPS = "distcp.max.maps";
public static final String CONF_LABEL_SOURCE_LISTING = "distcp.source.listing";
public static final String CONF_LABEL_COPY_STRATEGY = "distcp.copy.strategy";
public static final String CONF_LABEL_SKIP_CRC = "distcp.skip.crc";
public static final String CONF_LABEL_OVERWRITE = "distcp.copy.overwrite";
public static final String CONF_LABEL_APPEND = "distcp.copy.append";
public static final String CONF_LABEL_DIFF = "distcp.copy.diff";
public static final String CONF_LABEL_RDIFF = "distcp.copy.rdiff";
public static final String CONF_LABEL_BANDWIDTH_MB = "distcp.map.bandwidth.mb";
public static final String CONF_LABEL_SIMPLE_LISTING_FILESTATUS_SIZE =
"distcp.simplelisting.file.status.size";
public static final String CONF_LABEL_SIMPLE_LISTING_RANDOMIZE_FILES =
"distcp.simplelisting.randomize.files";
public static final String CONF_LABEL_FILTERS_FILE =
"distcp.filters.file";
public static final String CONF_LABEL_MAX_CHUNKS_TOLERABLE =
"distcp.dynamic.max.chunks.tolerable";
public static final String CONF_LABEL_MAX_CHUNKS_IDEAL =
"distcp.dynamic.max.chunks.ideal";
public static final String CONF_LABEL_MIN_RECORDS_PER_CHUNK =
"distcp.dynamic.min.records_per_chunk";
public static final String CONF_LABEL_SPLIT_RATIO =
"distcp.dynamic.split.ratio";
/* Total bytes to be copied. Updated by copylisting. Unfiltered count */
public static final String CONF_LABEL_TOTAL_BYTES_TO_BE_COPIED = "mapred.total.bytes.expected";
/* Total number of paths to copy, includes directories. Unfiltered count */
public static final String CONF_LABEL_TOTAL_NUMBER_OF_RECORDS = "mapred.number.of.records";
/* If input is based -f <>, file containing the src paths */
public static final String CONF_LABEL_LISTING_FILE_PATH = "distcp.listing.file.path";
/* Directory where the mapreduce job will write to. If not atomic commit, then same
as CONF_LABEL_TARGET_FINAL_PATH
*/
public static final String CONF_LABEL_TARGET_WORK_PATH = "distcp.target.work.path";
/* Directory where the final data will be committed to. If not atomic commit, then same
as CONF_LABEL_TARGET_WORK_PATH
*/
public static final String CONF_LABEL_TARGET_FINAL_PATH = "distcp.target.final.path";
/* Boolean to indicate whether the target of distcp exists. */
public static final String CONF_LABEL_TARGET_PATH_EXISTS = "distcp.target.path.exists";
/**
* DistCp job id for consumers of the Disctp
*/
public static final String CONF_LABEL_DISTCP_JOB_ID = "distcp.job.id";
/* Meta folder where the job's intermediate data is kept */
public static final String CONF_LABEL_META_FOLDER = "distcp.meta.folder";
/* DistCp CopyListing class override param */
public static final String CONF_LABEL_COPY_LISTING_CLASS = "distcp.copy.listing.class";
/* DistCp Copy Buffer Size */
public static final String CONF_LABEL_COPY_BUFFER_SIZE =
"distcp.copy.buffer.size";
/**
* Constants for DistCp return code to shell / consumer of ToolRunner's run
*/
public static final int SUCCESS = 0;
public static final int INVALID_ARGUMENT = -1;
public static final int DUPLICATE_INPUT = -2;
public static final int ACLS_NOT_SUPPORTED = -3;
public static final int XATTRS_NOT_SUPPORTED = -4;
public static final int UNKNOWN_ERROR = -999;
/**
* Constants for DistCp default values of configurable values
*/
public static final int MAX_CHUNKS_TOLERABLE_DEFAULT = 400;
public static final int MAX_CHUNKS_IDEAL_DEFAULT = 100;
public static final int MIN_RECORDS_PER_CHUNK_DEFAULT = 5;
public static final int SPLIT_RATIO_DEFAULT = 2;
/**
* Constants for NONE file deletion
*/
public static final String NONE_PATH_NAME = "/NONE";
public static final Path NONE_PATH = new Path(NONE_PATH_NAME);
public static final Path RAW_NONE_PATH = new Path(
DistCpConstants.HDFS_RESERVED_RAW_DIRECTORY_NAME + NONE_PATH_NAME);
/**
* Value of reserved raw HDFS directory when copying raw.* xattrs.
*/
public static final String HDFS_RESERVED_RAW_DIRECTORY_NAME = "/.reserved/raw";
static final String HDFS_DISTCP_DIFF_DIRECTORY_NAME = ".distcp.diff.tmp";
public static final int COPY_BUFFER_SIZE_DEFAULT = 8 * 1024;
/** Filename of sorted files in when tracking saves them. */
public static final String SOURCE_SORTED_FILE = "source_sorted.seq";
/** Filename of unsorted target listing. */
public static final String TARGET_LISTING_FILE = "target_listing.seq";
/** Filename of sorted target listing. */
public static final String TARGET_SORTED_FILE = "target_sorted.seq";
}
