/**
* Copyright 2009 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 java.io.IOException;
import java.util.Map;
import java.util.TreeMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
/**
* Import data written by {@link Export}.
*/
public class Import {
final static String NAME = "import";
public static final String CF_RENAME_PROP = "HBASE_IMPORTER_RENAME_CFS";
/**
* Write table content out to files in hdfs.
*/
static class Importer
extends TableMapper<ImmutableBytesWritable, Put> {
private Map<byte[], byte[]> cfRenameMap;
/**
* @param row The current table row key.
* @param value The columns.
* @param context The current context.
* @throws IOException When something is broken with the data.
* @see org.apache.hadoop.mapreduce.Mapper#map(KEYIN, VALUEIN,
* org.apache.hadoop.mapreduce.Mapper.Context)
*/
@Override
public void map(ImmutableBytesWritable row, Result value,
Context context)
throws IOException {
try {
context.write(row, resultToPut(row, value));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private Put resultToPut(ImmutableBytesWritable key, Result result)
throws IOException {
Put put = new Put(key.get());
for (KeyValue kv : result.raw()) {
if(cfRenameMap != null) {
// If there's a rename mapping for this CF, create a new KeyValue
byte[] newCfName = cfRenameMap.get(kv.getFamily());
if(newCfName != null) {
kv = new KeyValue(kv.getBuffer(), // row buffer
kv.getRowOffset(), // row offset
kv.getRowLength(), // row length
newCfName, // CF buffer
0, // CF offset
newCfName.length, // CF length
kv.getBuffer(), // qualifier buffer
kv.getQualifierOffset(), // qualifier offset
kv.getQualifierLength(), // qualifier length
kv.getTimestamp(), // timestamp
KeyValue.Type.codeToType(kv.getType()), // KV Type
kv.getBuffer(), // value buffer
kv.getValueOffset(), // value offset
kv.getValueLength()); // value length
}
}
put.add(kv);
}
return put;
}
@Override
public void setup(Context context) {
// Make a map from sourceCfName to destCfName by parsing a config key
cfRenameMap = null;
String allMappingsPropVal = context.getConfiguration().get(CF_RENAME_PROP);
if(allMappingsPropVal != null) {
// The conf value format should be sourceCf1:destCf1,sourceCf2:destCf2,...
String[] allMappings = allMappingsPropVal.split(",");
for (String mapping: allMappings) {
if(cfRenameMap == null) {
cfRenameMap = new TreeMap<byte[],byte[]>(Bytes.BYTES_COMPARATOR);
}
String [] srcAndDest = mapping.split(":");
if(srcAndDest.length != 2) {
continue;
}
cfRenameMap.put(srcAndDest[0].getBytes(), srcAndDest[1].getBytes());
}
}
}
}
/**
* <p>Sets a configuration property with key {@link #CF_RENAME_PROP} in conf that tells
* the mapper how to rename column families.
*
* <p>Alternately, instead of calling this function, you could set the configuration key
* {@link #CF_RENAME_PROP} yourself. The value should look like
* <pre>srcCf1:destCf1,srcCf2:destCf2,....</pre>. This would have the same effect on
* the mapper behavior.
*
* @param conf the Configuration in which the {@link #CF_RENAME_PROP} key will be
* set
* @param renameMap a mapping from source CF names to destination CF names
*/
static public void configureCfRenaming(Configuration conf,
Map<String, String> renameMap) {
StringBuilder sb = new StringBuilder();
for(Map.Entry<String,String> entry: renameMap.entrySet()) {
String sourceCf = entry.getKey();
String destCf = entry.getValue();
if(sourceCf.contains(":") || sourceCf.contains(",") ||
destCf.contains(":") || destCf.contains(",")) {
throw new IllegalArgumentException("Illegal character in CF names: "
+ sourceCf + ", " + destCf);
}
if(sb.length() != 0) {
sb.append(",");
}
sb.append(sourceCf + ":" + destCf);
}
conf.set(CF_RENAME_PROP, sb.toString());
}
/**
* 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 {
String tableName = args[0];
Path inputDir = new Path(args[1]);
Job job = new Job(conf, NAME + "_" + tableName);
job.setJarByClass(Importer.class);
FileInputFormat.setInputPaths(job, inputDir);
job.setInputFormatClass(SequenceFileInputFormat.class);
job.setMapperClass(Importer.class);
// No reducers. Just write straight to table. Call initTableReducerJob
// because it sets up the TableOutputFormat.
TableMapReduceUtil.initTableReducerJob(tableName, null, job);
job.setNumReduceTasks(0);
return job;
}
/*
* @param errorMsg Error message. Can be null.
*/
private static void usage(final String errorMsg) {
if (errorMsg != null && errorMsg.length() > 0) {
System.err.println("ERROR: " + errorMsg);
}
System.err.println("Usage: Import <tablename> <inputdir>");
}
/**
* 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();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
if (otherArgs.length < 2) {
usage("Wrong number of arguments: " + otherArgs.length);
System.exit(-1);
}
Job job = createSubmittableJob(conf, otherArgs);
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}