Java tutorial
package uk.bl.wa.hadoop.indexer.mdx; /* * #%L * warc-hadoop-indexer * %% * Copyright (C) 2013 - 2018 The webarchive-discovery project contributors * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-2.0.html>. * #L% */ import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.util.List; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.Options; import org.apache.commons.cli.ParseException; import org.apache.commons.cli.PosixParser; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.conf.Configured; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.Text; import org.apache.hadoop.io.compress.GzipCodec; import org.apache.hadoop.mapred.FileInputFormat; import org.apache.hadoop.mapred.FileOutputFormat; import org.apache.hadoop.mapred.JobClient; import org.apache.hadoop.mapred.JobConf; import org.apache.hadoop.mapred.MapReduceBase; import org.apache.hadoop.mapred.Mapper; import org.apache.hadoop.mapred.OutputCollector; import org.apache.hadoop.mapred.Reporter; import org.apache.hadoop.mapred.SequenceFileInputFormat; import org.apache.hadoop.mapred.lib.MultipleOutputs; import org.apache.hadoop.util.GenericOptionsParser; import org.apache.hadoop.util.Tool; import org.apache.hadoop.util.ToolRunner; import org.apache.zookeeper.KeeperException; import org.json.JSONArray; import org.json.JSONException; import uk.bl.wa.hadoop.KeylessTextOutputFormat; import uk.bl.wa.hadoop.mapred.ReservoirSamplingReducer; import uk.bl.wa.hadoop.mapreduce.mdx.MDX; import uk.bl.wa.solr.SolrFields; /** * WARCIndexerRunner * * Extracts text/metadata using from a series of Archive files. * * @author rcoram */ @SuppressWarnings({ "deprecation" }) public class MDXSeqSampleGenerator extends Configured implements Tool { private static final Log LOG = LogFactory.getLog(MDXSeqSampleGenerator.class); private static final String CLI_USAGE = "[-i <input file>] [-o <output dir>] [-r <#reducers>] [-w] [Wait for completion.]"; private static final String CLI_HEADER = "MapReduce job extracting data from MDX Sequence Files."; private String inputPath; private String outputPath; private boolean wait; public static String GEO_NAME = "geoSample"; public static String FORMATS_FFB_SAMPLE_NAME = "formatsExtSample"; public static String KEY_PREFIX = "__"; // Reducer count: private int numReducers = 1; /** * * @param args * @return * @throws IOException * @throws ParseException * @throws InterruptedException * @throws KeeperException */ protected void createJobConf(JobConf conf, String[] args) throws IOException, ParseException, KeeperException, InterruptedException { // Parse the command-line parameters. this.setup(args, conf); // Add input paths: LOG.info("Reading input files..."); String line = null; BufferedReader br = new BufferedReader(new FileReader(this.inputPath)); while ((line = br.readLine()) != null) { FileInputFormat.addInputPath(conf, new Path(line)); } br.close(); LOG.info("Read " + FileInputFormat.getInputPaths(conf).length + " input files."); FileOutputFormat.setOutputPath(conf, new Path(this.outputPath)); conf.setJobName(this.inputPath + "_" + System.currentTimeMillis()); conf.setInputFormat(SequenceFileInputFormat.class); conf.setMapperClass(MDXSeqSampleMapper.class); conf.setReducerClass(ReservoirSamplingReducer.class); conf.setOutputFormat(KeylessTextOutputFormat.class); conf.setOutputKeyClass(Text.class); conf.setOutputValueClass(Text.class); conf.setMapOutputKeyClass(Text.class); conf.setMapOutputValueClass(Text.class); conf.setNumReduceTasks(numReducers); MultipleOutputs.addMultiNamedOutput(conf, GEO_NAME, KeylessTextOutputFormat.class, Text.class, Text.class); MultipleOutputs.addMultiNamedOutput(conf, FORMATS_FFB_SAMPLE_NAME, KeylessTextOutputFormat.class, Text.class, Text.class); KeylessTextOutputFormat.setCompressOutput(conf, true); KeylessTextOutputFormat.setOutputCompressorClass(conf, GzipCodec.class); } /** * * Run the job: * * @throws InterruptedException * @throws KeeperException * */ public int run(String[] args) throws IOException, ParseException, KeeperException, InterruptedException { // Set up the base conf: JobConf conf = new JobConf(getConf(), MDXSeqSampleGenerator.class); // Get the job configuration: this.createJobConf(conf, args); // Submit it: if (this.wait) { JobClient.runJob(conf); } else { JobClient client = new JobClient(conf); client.submitJob(conf); } return 0; } private void setup(String[] args, JobConf conf) throws ParseException { // Process Hadoop args first: String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); // Process remaining args list this: Options options = new Options(); options.addOption("i", true, "input file list"); options.addOption("o", true, "output directory"); options.addOption("w", false, "wait for job to finish"); options.addOption("r", true, "number of reducers"); CommandLineParser parser = new PosixParser(); CommandLine cmd = parser.parse(options, otherArgs); if (!cmd.hasOption("i") || !cmd.hasOption("o")) { HelpFormatter helpFormatter = new HelpFormatter(); helpFormatter.setWidth(80); helpFormatter.printHelp(CLI_USAGE, CLI_HEADER, options, ""); System.exit(1); } this.inputPath = cmd.getOptionValue("i"); this.outputPath = cmd.getOptionValue("o"); this.wait = cmd.hasOption("w"); if (cmd.hasOption("r")) { this.numReducers = Integer.parseInt(cmd.getOptionValue("r")); } } /** * * @param args * @throws Exception */ public static void main(String[] args) throws Exception { int ret = ToolRunner.run(new MDXSeqSampleGenerator(), args); System.exit(ret); } /** * * @author Andrew Jackson <Andrew.Jackson@bl.uk> * */ static public class MDXSeqSampleMapper extends MapReduceBase implements Mapper<Text, Text, Text, Text> { static String getFirstOrNull(List<String> list) { if (list == null || list.isEmpty()) { return ""; } else { return list.get(0); } } @Override public void map(Text key, Text value, OutputCollector<Text, Text> output, Reporter reporter) throws IOException { try { // Parse the MDX: MDX mdx = new MDX(value.toString()); if (mdx.getTs() == null) { // FIXME Hack for older-style records, which used 'ts' // instead of // MDX.TIMESTAMP: mdx.setTs(mdx.getString("ts")); } String year = mdx.getTs().substring(0, 4); String year_month = year; if (mdx.getTs().length() >= 6) { year_month = mdx.getTs().substring(0, 6); } else { year_month = year + "xx"; } if (!"request".equals(mdx.getRecordType())) { // Look for postcodes and locations: // FIXME Hack as still using old properties field JSONArray postcodes = mdx.getJSONObject("properties").optJSONArray(SolrFields.POSTCODE); JSONArray locations = mdx.getJSONObject("properties").optJSONArray(SolrFields.LOCATIONS); if (postcodes != null) { for (int i = 0; i < postcodes.length(); i++) { String location = ""; if (locations != null && locations.length() == postcodes.length()) { location = locations.getString(i); } else { // Reporter; reporter.incrCounter("MDX-Records", "Unresolved-Locations", 1); } // Full geo-index String result = mdx.getTs() + "/" + mdx.getUrl() + "\t" + postcodes.get(i) + "\t" + location; output.collect(new Text(GEO_NAME + KEY_PREFIX + year_month), new Text(result)); } } // Look for examples from formats // FIXME Hack as still using old properties field String ct = mdx.getJSONObject("properties").optString(SolrFields.SOLR_CONTENT_TYPE); String ctext = mdx.getJSONObject("properties").optString(SolrFields.CONTENT_TYPE_EXT); String ctffb = mdx.getJSONObject("properties").optString(SolrFields.CONTENT_FFB); output.collect(new Text(FORMATS_FFB_SAMPLE_NAME + KEY_PREFIX + year), new Text(year + "\t" + ct + "\t" + ctext + "\t" + ctffb + "\t" + mdx.getTs() + "/" + mdx.getUrl())); } else { // Reporter; reporter.incrCounter("MDX-Records", "Ignored-" + mdx.getRecordType() + "-Record", 1); } } catch (JSONException e) { LOG.error("Error when processing: " + value, e); } } } }