com.hyperiongray.ccmr.s3wordcount.WordCountOnlyMapper.java Source code

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Here is the source code for com.hyperiongray.ccmr.s3wordcount.WordCountOnlyMapper.java

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package com.hyperiongray.ccmr.s3wordcount;

/*
 * 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 com.hadoop.examples.anagrams;

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.*;
import org.archive.io.ArchiveReader;
import org.archive.io.ArchiveRecord;
import org.archive.io.warc.WARCReaderFactory;
import org.jets3t.service.S3Service;
import org.jets3t.service.ServiceException;
import org.jets3t.service.impl.rest.httpclient.RestS3Service;
import org.jets3t.service.model.S3Object;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Map;

public class WordCountOnlyMapper extends MapReduceBase implements Mapper<Object, Text, NullWritable, Text> {

    private static final Logger logger = LoggerFactory.getLogger(WordCountOnlyMapper.class);
    private static final int LOWER_SCORE_THRESHOLD = 5;

    private OutputParser outputParser = new OutputParser();
    private Integer sampleSize;
    private ContentMatcher contentMatcher;

    public void configure(JobConf job) {
        String keywordsfileContent = job.get("keywordsFileContent");
        contentMatcher = new ContentMatcher(keywordsfileContent);
        sampleSize = job.getInt("sampleSize", 100);
        logger.info("Running with sampleSize of:" + sampleSize);
    }

    public void map(Object key, Text value, OutputCollector<NullWritable, Text> outputCollector, Reporter reporter)
            throws IOException {

        // We're accessing a publicly available bucket so don't need to fill in
        // our credentials
        ArchiveReader ar;
        try {
            S3Service s3s = new RestS3Service(null);

            // Let's grab a file out of the CommonCrawl S3 bucket
            String fn = value.toString();
            logger.info(fn);

            S3Object f = s3s.getObject("aws-publicdatasets", fn, null, null, null, null, null, null);

            // The file name identifies the ArchiveReader and indicates if it
            // should be decompressed
            ar = WARCReaderFactory.get(fn, f.getDataInputStream(), true);

        } catch (ServiceException e) {
            logger.error("S3 connection Failed", e);
            throw new RuntimeException(e);
        }

        // Once we have an ArchiveReader, we can work through each of the
        // records it contains
        int i = 0;
        logger.info("Started" + new Date());
        for (ArchiveRecord r : ar) {

            reporter.progress();
            String url = "";
            try {

                // The header file contains information such as the type of
                // record, size, creation time, and URL
                url = r.getHeader().getUrl();
                String crawledDate = r.getHeader().getDate();
                if (url == null)
                    continue;

                // If we want to read the contents of the record, we can use the
                // ArchiveRecord as an InputStream
                // Create a byte array that is as long as all the record's
                // stated length
                OutputStream os = new ByteArrayOutputStream();
                try {
                    r.dump(os);
                } finally {
                    try {
                        if (r != null)
                            r.close();
                    } catch (Exception e) {
                        logger.error("reading inputstream Failed", e);
                    }
                }
                // Note: potential optimization would be to have a large buffer
                // only allocated once

                // Why don't we convert it to a string and print the start of
                // it?
                String content = new String(os.toString());

                Map<String, Integer> matches = contentMatcher.matchContent(content);
                int score = contentMatcher.score(matches);

                if (score > LOWER_SCORE_THRESHOLD) {

                    logger.info("****************************************");
                    logger.info("URL: " + url + " Score: " + score + " Detail: " + matches);
                    // outputCollector.collect(new IntWritable(score), new Text(url));
                    outputCollector.collect(NullWritable.get(), new Text(outputParser
                            .parse(contentMatcher.getTitle(content), url, crawledDate, score, matches)));
                }

                logger.debug(new Integer(i).toString());

                if (i++ > sampleSize) {
                    logger.info("Finished " + new Date());
                    break;
                }

            } catch (Exception e) {
                logger.error("url failed " + url, e);
            }
        }

    }

}