source: sample/hadoop-0.16/tw/org/nchc/demo/LogFetcher.java @ 31

/**
 * Program: LogFetcher.java
 * Editor: Waue Chen 
 * From :  NCHC. Taiwn
 * Last Update Date: 07/02/2008
 */
/**
 * Purpose : 
 *  This program will parse your apache log and store it into Hbase.
 * 
 * HowToUse : 
 *  Make sure two thing :
 *  1. Upload apache logs ( /var/log/apache2/access.log* ) to \ 
 *    hdfs (default: /user/waue/apache-log) \
 *   $ bin/hadoop dfs -put /var/log/apache2/ apache-log
 *  2. parameter "dir" in main contains the logs.
 *  3. you should filter the exception contents manually, \ 
 *    ex:  ::1 - - [29/Jun/2008:07:35:15 +0800] "GET / HTTP/1.0" 200 729 "...
 *  
 * Check Result:
 *  Go to hbase console, type : 
 *    hql > select * from apache-log;

+-------------------------+-------------------------+-------------------------+
| Row                     | Column                  | Cell                    |
+-------------------------+-------------------------+-------------------------+
| 118.170.101.250         | http:agent              | Mozilla/4.0 (compatible;|
|                         |                         |  MSIE 4.01; Windows 95) |
+-------------------------+-------------------------+-------------------------+
| 118.170.101.250         | http:bytesize           | 318                     |
+-------------------------+-------------------------+-------------------------+
..........(skip)........
+-------------------------+-------------------------+-------------------------+
| 87.65.93.58             | http:method             | OPTIONS                 |
+-------------------------+-------------------------+-------------------------+
| 87.65.93.58             | http:protocol           | HTTP/1.1                |
+-------------------------+-------------------------+-------------------------+
| 87.65.93.58             | referrer:-              | *                       |
+-------------------------+-------------------------+-------------------------+
| 87.65.93.58             | url:*                   | -                       |
+-------------------------+-------------------------+-------------------------+
31 row(s) in set. (0.58 sec)

 */


package tw.org.nchc.demo;

import java.io.IOException;
import java.text.ParseException;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseAdmin;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTable;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.ClusterStatus;
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 AccessLogParser
/**
 * Access_log fetcher. TODO: FgnStatLog, Error_log, Access_log (Default,
 * W3CExtended, IISw3cExtended)
 */
public class LogFetcher {
  static HBaseConfiguration conf = new HBaseConfiguration();

  public static final String TABLE = "table.name";

  static String tableName;

  static HTable table = null;

  static boolean eclipseRun = false;

  public static class MapClass extends MapReduceBase implements
      Mapper<WritableComparable, Text, Text, Writable> {

    @Override
    public void configure(JobConf job) {
      tableName = job.get(TABLE, "");
    }

    public void map(WritableComparable key, Text value,
        OutputCollector<Text, Writable> output, Reporter reporter)
        throws IOException {
      try {
        
        AccessLogParser log = new AccessLogParser(value.toString());
        if (table == null)
          table = new HTable(conf, new Text(tableName));
        long lockId = table.startUpdate(new Text(log.getIp()));
        table.put(lockId, new Text("http:protocol"), log.getProtocol()
            .getBytes());
        table.put(lockId, new Text("http:method"), log.getMethod()
            .getBytes());
        table.put(lockId, new Text("http:code"), log.getCode()
            .getBytes());
        table.put(lockId, new Text("http:bytesize"), log.getByteSize()
            .getBytes());
        table.put(lockId, new Text("http:agent"), log.getAgent()
            .getBytes());
        table.put(lockId, new Text("url:" + log.getUrl()), log
            .getReferrer().getBytes());
        table.put(lockId, new Text("referrer:" + log.getReferrer()),
            log.getUrl().getBytes());
        table.commit(lockId, log.getTimestamp());
      } catch (ParseException e) {
        e.printStackTrace();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }
//   do it to resolve warning : FileSystem.listPaths 
  static public Path[] listPaths(FileSystem fsm,Path path) throws IOException
  {
    FileStatus[] fss = fsm.listStatus(path);
    int length = fss.length;
    Path[] pi = new Path[length];
    for (int i=0 ; i< length; i++)
    {
      pi[i] = fss[i].getPath();
    }
    return pi;
  } 
  public static void runMapReduce(String table, String dir)
      throws IOException {
    Path tempDir = new Path("log/temp");
    Path InputDir = new Path(dir);
    FileSystem fs = FileSystem.get(conf);
    JobConf jobConf = new JobConf(conf, LogFetcher.class);
    jobConf.setJobName("apache log fetcher");
    jobConf.set(TABLE, table);
    Path[] in = listPaths(fs, InputDir);
    if (fs.isFile(InputDir)) {
      jobConf.setInputPath(InputDir);
    } else {
      for (int i = 0; i < in.length; i++) {
        if (fs.isFile(in[i])) {
          jobConf.addInputPath(in[i]);
        } else {
          Path[] sub = listPaths(fs, in[i]);
          for (int j = 0; j < sub.length; j++) {
            if (fs.isFile(sub[j])) {
              jobConf.addInputPath(sub[j]);
            }
          }
        }
      }
    }
    jobConf.setOutputPath(tempDir);
    
    jobConf.setMapperClass(MapClass.class);

    JobClient client = new JobClient(jobConf);
    ClusterStatus cluster = client.getClusterStatus();
    jobConf.setNumMapTasks(cluster.getMapTasks());
    jobConf.setNumReduceTasks(0);

    JobClient.runJob(jobConf);

    fs.delete(tempDir);   
    fs.close();
  }

  public static void creatTable(String table) throws IOException {
    HBaseAdmin admin = new HBaseAdmin(conf);
    if (!admin.tableExists(new Text(table))) {
      System.out.println("1. " + table
          + " table creating ... please wait");
      HTableDescriptor tableDesc = new HTableDescriptor(table);
      tableDesc.addFamily(new HColumnDescriptor("http:"));
      tableDesc.addFamily(new HColumnDescriptor("url:"));
      tableDesc.addFamily(new HColumnDescriptor("referrer:"));
      admin.createTable(tableDesc);
    } else {
      System.out.println("1. " + table + " table already exists.");
    }
    System.out.println("2. access_log files fetching using map/reduce");
  }

  public static void main(String[] args) throws IOException {
    String table_name = "log";
    String dir = "apache-log";

    if (eclipseRun) {
      table_name = "log";
      dir = "apache-log";
    } else if (args.length < 2) {
      System.out
          .println("Usage: logfetcher <access_log file or directory> <table_name>");
      System.exit(1);
    } else {
      table_name = args[1];
      dir = args[0];
    }
    creatTable(table_name);
    runMapReduce(table_name, dir);

  }

}