/**
* Copyright 2010 The Apache Software Foundation
*
* 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.mapreduce.Job;
import java.io.IOException;
/**
* 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.
*/
public class CopyTable {
final static String NAME = "copytable";
static String rsClass = null;
static String rsImpl = null;
static long startTime = 0;
static long endTime = 0;
static String tableName = null;
static String newTableName = null;
static String peerAddress = null;
static String families = null;
/**
* Sets up the actual job.
*
* @param conf The current configuration.
* @param args The command line parameters.
* @return The newly created job.
* @throws IOException When setting up the job fails.
*/
public static Job createSubmittableJob(Configuration conf, String[] args)
throws IOException {
if (!doCommandLine(args)) {
return null;
}
Job job = new Job(conf, NAME + "_" + tableName);
job.setJarByClass(CopyTable.class);
Scan scan = new Scan();
if (startTime != 0) {
scan.setTimeRange(startTime,
endTime == 0 ? HConstants.LATEST_TIMESTAMP : endTime);
}
if(families != null) {
String[] fams = families.split(",");
for(String fam : fams) {
scan.addFamily(Bytes.toBytes(fam));
}
}
TableMapReduceUtil.initTableMapperJob(tableName, scan,
Import.Importer.class, null, null, job);
TableMapReduceUtil.initTableReducerJob(
newTableName == null ? tableName : newTableName, null, job,
null, peerAddress, rsClass, rsImpl);
job.setNumReduceTasks(0);
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 [--rs.class=CLASS] " +
"[--rs.impl=IMPL] [--starttime=X] [--endtime=Y] " +
"[--new.name=NEW] [--peer.adr=ADR] <tablename>");
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(" starttime beginning of the time range");
System.err.println(" without endtime means from starttime to forever");
System.err.println(" endtime end of the time range");
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.zookeeer.quorum:hbase.zookeeper.client.port:zookeeper.znode.parent");
System.err.println(" families comma-seperated list of families to copy");
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(" $ bin/hbase " +
"org.apache.hadoop.hbase.mapreduce.CopyTable --rs.class=org.apache.hadoop.hbase.ipc.ReplicationRegionInterface " +
"--rs.impl=org.apache.hadoop.hbase.regionserver.replication.ReplicationRegionServer --starttime=1265875194289 --endtime=1265878794289 " +
"--peer.adr=server1,server2,server3:2181:/hbase TestTable ");
}
private static boolean doCommandLine(final String[] args) {
// Process command-line args. TODO: Better cmd-line processing
// (but hopefully something not as painful as cli options).
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 rsClassArgKey = "--rs.class=";
if (cmd.startsWith(rsClassArgKey)) {
rsClass = cmd.substring(rsClassArgKey.length());
continue;
}
final String rsImplArgKey = "--rs.impl=";
if (cmd.startsWith(rsImplArgKey)) {
rsImpl = cmd.substring(rsImplArgKey.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 newNameArgKey = "--new.name=";
if (cmd.startsWith(newNameArgKey)) {
newTableName = 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 (i == args.length-1) {
tableName = cmd;
}
}
if (newTableName == null && peerAddress == null) {
printUsage("At least a new table name or a " +
"peer address must be specified");
return false;
}
} 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 {
Configuration conf = HBaseConfiguration.create();
Job job = createSubmittableJob(conf, args);
if (job != null) {
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
}