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This module contains implementations of InputFormat, OutputFormat, Mapper, Reducer, etc which
are needed for running MR jobs on tables, WALs, HFiles and other HBase specific constructs.
It also contains a bunch of tools: RowCounter, ImportTsv, Import, Export, CompactionTool,
ExportSnapshot, WALPlayer, etc
/*
* 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.hbase.mapreduce;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.mapreduce.Import.CellImporter;
import org.apache.hadoop.hbase.mapreduce.Import.Importer;
import org.apache.hadoop.hbase.tool.LoadIncrementalHFiles;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.CommonFSUtils;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Tool used to copy a table to another one which can be on a different setup. It is also
* configurable with a start and time as well as a specification of the region server implementation
* if different from the local cluster.
*/
@InterfaceAudience.Public
public class CopyTable extends Configured implements Tool {
private static final Logger LOG = LoggerFactory.getLogger(CopyTable.class);
final static String NAME = "copytable";
long startTime = 0;
long endTime = HConstants.LATEST_TIMESTAMP;
int batch = Integer.MAX_VALUE;
int cacheRow = -1;
int versions = -1;
String tableName = null;
String startRow = null;
String stopRow = null;
String dstTableName = null;
String peerAddress = null;
String families = null;
boolean allCells = false;
static boolean shuffle = false;
boolean bulkload = false;
Path bulkloadDir = null;
boolean readingSnapshot = false;
String snapshot = null;
private final static String JOB_NAME_CONF_KEY = "mapreduce.job.name";
private Path generateUniqTempDir(boolean withDirCreated) throws IOException {
FileSystem fs = CommonFSUtils.getCurrentFileSystem(getConf());
Path dir = new Path(fs.getWorkingDirectory(), NAME);
if (!fs.exists(dir)) {
fs.mkdirs(dir);
}
Path newDir = new Path(dir, UUID.randomUUID().toString());
if (withDirCreated) {
fs.mkdirs(newDir);
}
return newDir;
}
private void initCopyTableMapperReducerJob(Job job, Scan scan) throws IOException {
Class mapper = bulkload ? CellImporter.class : Importer.class;
if (readingSnapshot) {
TableMapReduceUtil.initTableSnapshotMapperJob(snapshot, scan, mapper, null, null, job, true,
generateUniqTempDir(true));
} else {
TableMapReduceUtil.initTableMapperJob(tableName, scan, mapper, null, null, job);
}
}
/**
* Sets up the actual job.
* @param args The command line parameters.
* @return The newly created job.
* @throws IOException When setting up the job fails.
*/
public Job createSubmittableJob(String[] args) throws IOException {
if (!doCommandLine(args)) {
return null;
}
String jobName = NAME + "_" + (tableName == null ? snapshot : tableName);
Job job = Job.getInstance(getConf(), getConf().get(JOB_NAME_CONF_KEY, jobName));
job.setJarByClass(CopyTable.class);
Scan scan = new Scan();
scan.setBatch(batch);
scan.setCacheBlocks(false);
if (cacheRow > 0) {
scan.setCaching(cacheRow);
} else {
scan.setCaching(getConf().getInt(HConstants.HBASE_CLIENT_SCANNER_CACHING, 100));
}
scan.setTimeRange(startTime, endTime);
if (allCells) {
scan.setRaw(true);
}
if (shuffle) {
job.getConfiguration().set(TableInputFormat.SHUFFLE_MAPS, "true");
}
if (versions >= 0) {
scan.readVersions(versions);
}
if (startRow != null) {
scan.withStartRow(Bytes.toBytesBinary(startRow));
}
if (stopRow != null) {
scan.withStopRow(Bytes.toBytesBinary(stopRow));
}
if (families != null) {
String[] fams = families.split(",");
Map cfRenameMap = new HashMap<>();
for (String fam : fams) {
String sourceCf;
if (fam.contains(":")) {
// fam looks like "sourceCfName:destCfName"
String[] srcAndDest = fam.split(":", 2);
sourceCf = srcAndDest[0];
String destCf = srcAndDest[1];
cfRenameMap.put(sourceCf, destCf);
} else {
// fam is just "sourceCf"
sourceCf = fam;
}
scan.addFamily(Bytes.toBytes(sourceCf));
}
Import.configureCfRenaming(job.getConfiguration(), cfRenameMap);
}
job.setNumReduceTasks(0);
if (bulkload) {
initCopyTableMapperReducerJob(job, scan);
// We need to split the inputs by destination tables so that output of Map can be bulk-loaded.
TableInputFormat.configureSplitTable(job, TableName.valueOf(dstTableName));
bulkloadDir = generateUniqTempDir(false);
LOG.info("HFiles will be stored at " + this.bulkloadDir);
HFileOutputFormat2.setOutputPath(job, bulkloadDir);
try (Connection conn = ConnectionFactory.createConnection(getConf());
Admin admin = conn.getAdmin()) {
HFileOutputFormat2.configureIncrementalLoadMap(job,
admin.getDescriptor((TableName.valueOf(dstTableName))));
}
} else {
initCopyTableMapperReducerJob(job, scan);
TableMapReduceUtil.initTableReducerJob(dstTableName, null, job, null, peerAddress, null,
null);
}
return job;
}
/*
* @param errorMsg Error message. Can be null.
*/
private static void printUsage(final String errorMsg) {
if (errorMsg != null && errorMsg.length() > 0) {
System.err.println("ERROR: " + errorMsg);
}
System.err.println("Usage: CopyTable [general options] [--starttime=X] [--endtime=Y] "
+ "[--new.name=NEW] [--peer.adr=ADR] ");
System.err.println();
System.err.println("Options:");
System.err.println(" rs.class hbase.regionserver.class of the peer cluster");
System.err.println(" specify if different from current cluster");
System.err.println(" rs.impl hbase.regionserver.impl of the peer cluster");
System.err.println(" startrow the start row");
System.err.println(" stoprow the stop row");
System.err.println(" starttime beginning of the time range (unixtime in millis)");
System.err.println(" without endtime means from starttime to forever");
System.err.println(" endtime end of the time range. Ignored if no starttime specified.");
System.err.println(" versions number of cell versions to copy");
System.err.println(" new.name new table's name");
System.err.println(" peer.adr Address of the peer cluster given in the format");
System.err.println(" hbase.zookeeper.quorum:hbase.zookeeper.client"
+ ".port:zookeeper.znode.parent");
System.err.println(" families comma-separated list of families to copy");
System.err.println(" To copy from cf1 to cf2, give sourceCfName:destCfName. ");
System.err.println(" To keep the same name, just give \"cfName\"");
System.err.println(" all.cells also copy delete markers and deleted cells");
System.err
.println(" bulkload Write input into HFiles and bulk load to the destination " + "table");
System.err.println(" snapshot Copy the data from snapshot to destination table.");
System.err.println();
System.err.println("Args:");
System.err.println(" tablename Name of the table to copy");
System.err.println();
System.err.println("Examples:");
System.err
.println(" To copy 'TestTable' to a cluster that uses replication for a 1 hour window:");
System.err.println(" $ hbase "
+ "org.apache.hadoop.hbase.mapreduce.CopyTable --starttime=1265875194289 --endtime=1265878794289 "
+ "--peer.adr=server1,server2,server3:2181:/hbase --families=myOldCf:myNewCf,cf2,cf3 TestTable ");
System.err.println(" To copy data from 'sourceTableSnapshot' to 'destTable': ");
System.err.println(" $ hbase org.apache.hadoop.hbase.mapreduce.CopyTable "
+ "--snapshot --new.name=destTable sourceTableSnapshot");
System.err.println(" To copy data from 'sourceTableSnapshot' and bulk load to 'destTable': ");
System.err.println(" $ hbase org.apache.hadoop.hbase.mapreduce.CopyTable "
+ "--new.name=destTable --snapshot --bulkload sourceTableSnapshot");
System.err.println("For performance consider the following general option:\n"
+ " It is recommended that you set the following to >=100. A higher value uses more memory but\n"
+ " decreases the round trip time to the server and may increase performance.\n"
+ " -Dhbase.client.scanner.caching=100\n"
+ " The following should always be set to false, to prevent writing data twice, which may produce \n"
+ " inaccurate results.\n" + " -Dmapreduce.map.speculative=false");
}
private boolean doCommandLine(final String[] args) {
if (args.length < 1) {
printUsage(null);
return false;
}
try {
for (int i = 0; i < args.length; i++) {
String cmd = args[i];
if (cmd.equals("-h") || cmd.startsWith("--h")) {
printUsage(null);
return false;
}
final String startRowArgKey = "--startrow=";
if (cmd.startsWith(startRowArgKey)) {
startRow = cmd.substring(startRowArgKey.length());
continue;
}
final String stopRowArgKey = "--stoprow=";
if (cmd.startsWith(stopRowArgKey)) {
stopRow = cmd.substring(stopRowArgKey.length());
continue;
}
final String startTimeArgKey = "--starttime=";
if (cmd.startsWith(startTimeArgKey)) {
startTime = Long.parseLong(cmd.substring(startTimeArgKey.length()));
continue;
}
final String endTimeArgKey = "--endtime=";
if (cmd.startsWith(endTimeArgKey)) {
endTime = Long.parseLong(cmd.substring(endTimeArgKey.length()));
continue;
}
final String batchArgKey = "--batch=";
if (cmd.startsWith(batchArgKey)) {
batch = Integer.parseInt(cmd.substring(batchArgKey.length()));
continue;
}
final String cacheRowArgKey = "--cacheRow=";
if (cmd.startsWith(cacheRowArgKey)) {
cacheRow = Integer.parseInt(cmd.substring(cacheRowArgKey.length()));
continue;
}
final String versionsArgKey = "--versions=";
if (cmd.startsWith(versionsArgKey)) {
versions = Integer.parseInt(cmd.substring(versionsArgKey.length()));
continue;
}
final String newNameArgKey = "--new.name=";
if (cmd.startsWith(newNameArgKey)) {
dstTableName = cmd.substring(newNameArgKey.length());
continue;
}
final String peerAdrArgKey = "--peer.adr=";
if (cmd.startsWith(peerAdrArgKey)) {
peerAddress = cmd.substring(peerAdrArgKey.length());
continue;
}
final String familiesArgKey = "--families=";
if (cmd.startsWith(familiesArgKey)) {
families = cmd.substring(familiesArgKey.length());
continue;
}
if (cmd.startsWith("--all.cells")) {
allCells = true;
continue;
}
if (cmd.startsWith("--bulkload")) {
bulkload = true;
continue;
}
if (cmd.startsWith("--shuffle")) {
shuffle = true;
continue;
}
if (cmd.startsWith("--snapshot")) {
readingSnapshot = true;
continue;
}
if (i == args.length - 1) {
if (readingSnapshot) {
snapshot = cmd;
} else {
tableName = cmd;
}
} else {
printUsage("Invalid argument '" + cmd + "'");
return false;
}
}
if (dstTableName == null && peerAddress == null) {
printUsage("At least a new table name or a peer address must be specified");
return false;
}
if ((endTime != 0) && (startTime > endTime)) {
printUsage("Invalid time range filter: starttime=" + startTime + " > endtime=" + endTime);
return false;
}
if (bulkload && peerAddress != null) {
printUsage("Remote bulkload is not supported!");
return false;
}
if (readingSnapshot && peerAddress != null) {
printUsage("Loading data from snapshot to remote peer cluster is not supported.");
return false;
}
if (readingSnapshot && dstTableName == null) {
printUsage("The --new.name= for destination table should be "
+ "provided when copying data from snapshot .");
return false;
}
if (readingSnapshot && snapshot == null) {
printUsage("Snapshot shouldn't be null when --snapshot is enabled.");
return false;
}
// set dstTableName if necessary
if (dstTableName == null) {
dstTableName = tableName;
}
} catch (Exception e) {
e.printStackTrace();
printUsage("Can't start because " + e.getMessage());
return false;
}
return true;
}
/**
* Main entry point.
* @param args The command line parameters.
* @throws Exception When running the job fails.
*/
public static void main(String[] args) throws Exception {
int ret = ToolRunner.run(HBaseConfiguration.create(), new CopyTable(), args);
System.exit(ret);
}
@Override
public int run(String[] args) throws Exception {
Job job = createSubmittableJob(args);
if (job == null) return 1;
if (!job.waitForCompletion(true)) {
LOG.info("Map-reduce job failed!");
if (bulkload) {
LOG.info("Files are not bulkloaded!");
}
return 1;
}
int code = 0;
if (bulkload) {
LOG.info("Trying to bulk load data to destination table: " + dstTableName);
LOG.info("command: ./bin/hbase org.apache.hadoop.hbase.tool.LoadIncrementalHFiles {} {}",
this.bulkloadDir.toString(), this.dstTableName);
code = new LoadIncrementalHFiles(this.getConf())
.run(new String[] { this.bulkloadDir.toString(), this.dstTableName });
if (code == 0) {
// bulkloadDir is deleted only LoadIncrementalHFiles was successful so that one can rerun
// LoadIncrementalHFiles.
FileSystem fs = CommonFSUtils.getCurrentFileSystem(getConf());
if (!fs.delete(this.bulkloadDir, true)) {
LOG.error("Deleting folder " + bulkloadDir + " failed!");
code = 1;
}
}
}
return code;
}
}
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