| /* |
| * 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.accumulo.examples.simple.mapreduce; |
| |
| import java.io.IOException; |
| import java.util.AbstractMap.SimpleImmutableEntry; |
| import java.util.HashSet; |
| import java.util.Map; |
| |
| import org.apache.accumulo.core.cli.MapReduceClientOnRequiredTable; |
| import org.apache.accumulo.core.client.AccumuloSecurityException; |
| import org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.util.Pair; |
| import org.apache.accumulo.core.util.format.DefaultFormatter; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.conf.Configured; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.Mapper; |
| import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; |
| import org.apache.hadoop.util.Tool; |
| import org.apache.hadoop.util.ToolRunner; |
| |
| import com.beust.jcommander.Parameter; |
| |
| /** |
| * Takes a table and outputs the specified column to a set of part files on hdfs |
| * |
| * <p> |
| * CLI options (in order): |
| * <ul> |
| * <li>username |
| * <li>password |
| * <li>tablename |
| * <li>column |
| * <li>hdfs-output-path |
| * </ul> |
| */ |
| public class TableToFile extends Configured implements Tool { |
| |
| static class Opts extends MapReduceClientOnRequiredTable { |
| @Parameter(names = "--output", description = "output directory", required = true) |
| String output; |
| @Parameter(names = "--columns", description = "columns to extract, in cf:cq{,cf:cq,...} form") |
| String columns = ""; |
| } |
| |
| /** |
| * The Mapper class that given a row number, will generate the appropriate output line. |
| */ |
| public static class TTFMapper extends Mapper<Key,Value,NullWritable,Text> { |
| @Override |
| public void map(Key row, Value data, Context context) throws IOException, InterruptedException { |
| Map.Entry<Key,Value> entry = new SimpleImmutableEntry<>(row, data); |
| context.write(NullWritable.get(), new Text(DefaultFormatter.formatEntry(entry, false))); |
| context.setStatus("Outputed Value"); |
| } |
| } |
| |
| @Override |
| public int run(String[] args) |
| throws IOException, InterruptedException, ClassNotFoundException, AccumuloSecurityException { |
| Job job = Job.getInstance(getConf()); |
| job.setJobName(this.getClass().getSimpleName() + "_" + System.currentTimeMillis()); |
| job.setJarByClass(this.getClass()); |
| Opts opts = new Opts(); |
| opts.parseArgs(getClass().getName(), args); |
| |
| job.setInputFormatClass(AccumuloInputFormat.class); |
| opts.setAccumuloConfigs(job); |
| |
| HashSet<Pair<Text,Text>> columnsToFetch = new HashSet<>(); |
| for (String col : opts.columns.split(",")) { |
| int idx = col.indexOf(":"); |
| Text cf = new Text(idx < 0 ? col : col.substring(0, idx)); |
| Text cq = idx < 0 ? null : new Text(col.substring(idx + 1)); |
| if (cf.getLength() > 0) |
| columnsToFetch.add(new Pair<>(cf, cq)); |
| } |
| if (!columnsToFetch.isEmpty()) |
| AccumuloInputFormat.fetchColumns(job, columnsToFetch); |
| |
| job.setMapperClass(TTFMapper.class); |
| job.setMapOutputKeyClass(NullWritable.class); |
| job.setMapOutputValueClass(Text.class); |
| |
| job.setNumReduceTasks(0); |
| |
| job.setOutputFormatClass(TextOutputFormat.class); |
| TextOutputFormat.setOutputPath(job, new Path(opts.output)); |
| |
| job.waitForCompletion(true); |
| return job.isSuccessful() ? 0 : 1; |
| } |
| |
| /** |
| * |
| * @param args |
| * instanceName zookeepers username password table columns outputpath |
| */ |
| public static void main(String[] args) throws Exception { |
| ToolRunner.run(new Configuration(), new TableToFile(), args); |
| } |
| } |