| /* |
| * 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.filedata; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Map.Entry; |
| |
| import org.apache.accumulo.core.cli.MapReduceClientOnRequiredTable; |
| import org.apache.accumulo.core.client.mapreduce.AccumuloOutputFormat; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Mutation; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.iterators.user.SummingArrayCombiner; |
| import org.apache.accumulo.core.security.ColumnVisibility; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.conf.Configured; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.Mapper; |
| import org.apache.hadoop.util.Tool; |
| import org.apache.hadoop.util.ToolRunner; |
| |
| import com.beust.jcommander.Parameter; |
| |
| /** |
| * A MapReduce that computes a histogram of byte frequency for each file and stores the histogram |
| * alongside the file data. The {@link ChunkInputFormat} is used to read the file data from |
| * Accumulo. See docs/examples/README.filedata for instructions. |
| */ |
| public class CharacterHistogram extends Configured implements Tool { |
| public static final String VIS = "vis"; |
| |
| public static void main(String[] args) throws Exception { |
| System.exit(ToolRunner.run(new Configuration(), new CharacterHistogram(), args)); |
| } |
| |
| public static class HistMapper extends Mapper<List<Entry<Key,Value>>,InputStream,Text,Mutation> { |
| private ColumnVisibility cv; |
| |
| @Override |
| public void map(List<Entry<Key,Value>> k, InputStream v, Context context) |
| throws IOException, InterruptedException { |
| Long[] hist = new Long[256]; |
| for (int i = 0; i < hist.length; i++) |
| hist[i] = 0l; |
| int b = v.read(); |
| while (b >= 0) { |
| hist[b] += 1l; |
| b = v.read(); |
| } |
| v.close(); |
| Mutation m = new Mutation(k.get(0).getKey().getRow()); |
| m.put("info", "hist", cv, |
| new Value(SummingArrayCombiner.STRING_ARRAY_ENCODER.encode(Arrays.asList(hist)))); |
| context.write(new Text(), m); |
| } |
| |
| @Override |
| protected void setup(Context context) throws IOException, InterruptedException { |
| cv = new ColumnVisibility(context.getConfiguration().get(VIS, "")); |
| } |
| } |
| |
| static class Opts extends MapReduceClientOnRequiredTable { |
| @Parameter(names = "--vis") |
| String visibilities = ""; |
| } |
| |
| @Override |
| public int run(String[] args) throws Exception { |
| Job job = Job.getInstance(getConf()); |
| job.setJobName(this.getClass().getSimpleName()); |
| job.setJarByClass(this.getClass()); |
| |
| Opts opts = new Opts(); |
| opts.parseArgs(CharacterHistogram.class.getName(), args); |
| |
| job.setInputFormatClass(ChunkInputFormat.class); |
| opts.setAccumuloConfigs(job); |
| job.getConfiguration().set(VIS, opts.visibilities.toString()); |
| |
| job.setMapperClass(HistMapper.class); |
| job.setMapOutputKeyClass(Text.class); |
| job.setMapOutputValueClass(Mutation.class); |
| |
| job.setNumReduceTasks(0); |
| |
| job.setOutputFormatClass(AccumuloOutputFormat.class); |
| |
| job.waitForCompletion(true); |
| return job.isSuccessful() ? 0 : 1; |
| } |
| } |