---------- Forwarded message ----------
From: air <cnwe...@gmail.com>
Date: 2011/7/28
Subject: HBase Mapreduce cannot find Map class
To: CDH Users <cdh-u...@cloudera.org>
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.mapred.TableMapReduceUtil;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
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.FileInputFormat;
import org.apache.hadoop.mapred.lib.NullOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
public class LoadToHBase extends Configured implements Tool{
public static class XMap<K, V> extends MapReduceBase implements
Mapper<LongWritable, Text, K, V>{
private JobConf conf;
@Override
public void configure(JobConf conf){
this.conf = conf;
try{
this.table = new HTable(new HBaseConfiguration(conf),
"observations");
}catch(IOException e){
throw new RuntimeException("Failed HTable construction", e);
}
}
@Override
public void close() throws IOException{
super.close();
table.close();
}
private HTable table;
public void map(LongWritable key, Text value, OutputCollector
output, Reporter reporter) throws IOException{
String[] valuelist = value.toString().split("\t");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd
HH:mm:ss");
Date addtime = null; // 用户注册时间
Date ds = null;
Long delta_days = null;
String uid = valuelist[0];
try {
addtime = sdf.parse(valuelist[1]);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String ds_str = conf.get("load.hbase.ds", null);
if (ds_str != null){
try {
ds = sdf.parse(ds_str);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else{
ds_str = "2011-07-28";
}
if (addtime != null && ds != null){
delta_days = (ds.getTime() - addtime.getTime()) / (24 * 60 *
60 * 1000);
}
if (delta_days != null){
byte[] rowKey = uid.getBytes();
Put p = new Put(rowKey);
p.add("content".getBytes(), "attr1".getBytes(),
delta_days.toString().getBytes());
table.put(p);
}
}
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
int exitCode = ToolRunner.run(new HBaseConfiguration(), new
LoadToHBase(), args);
System.exit(exitCode);
}
@Override
public int run(String[] args) throws Exception {
// TODO Auto-generated method stub
JobConf conf = new JobConf(getClass());
TableMapReduceUtil.addDependencyJars(conf);
FileInputFormat.addInputPath(conf, new Path(args[0]));
conf.setJobName("LoadToHBase");
conf.setJarByClass(getClass());
conf.setMapperClass(XMap.class);
conf.setNumReduceTasks(0);
conf.setOutputFormat(NullOutputFormat.class);
JobClient.runJob(conf);
return 0;
}
}
execute it using hbase LoadToHBase /user/hive/warehouse/datamining.db/xxx/
and it says:
......
11/07/28 17:20:29 INFO mapred.JobClient: Task Id :
attempt_201107261532_2625_m_000004_1, Status : FAILED
java.lang.RuntimeException: Error in configuring object
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:387)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:325)
at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1127)
at org.apache.hadoop.mapred.Child.main(Child.java:264)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 9 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException:
java.lang.ClassNotFoundException: LoadToHBase$XMap
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1028)
at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:968)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
... 14 more
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException:
LoadToHBase$XMap
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:996)
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1020)
... 16 more
Caused by: java.lang.ClassNotFoundException: LoadToHBase$XMap
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at
org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:943)
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:994)
... 17 more
11/07/28 17:20:29 INFO mapred.JobClient: Task Id :
attempt_201107261532_2625_m_000006_1, Status : FAILED
java.lang.RuntimeException: Error in configuring object
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:387)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:325)
at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1127)
at org.apache.hadoop.mapred.Child.main(Child.java:264)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 9 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException:
java.lang.ClassNotFoundException: LoadToHBase$XMap
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1028)
at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:968)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
... 14 more
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException:
LoadToHBase$XMap
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:996)
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1020)
... 16 more
Caused by: java.lang.ClassNotFoundException: LoadToHBase$XMap
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at
org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:943)
at
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:994)
11/07/28 17:20:29 INFO mapred.JobClient: Job complete: job_201107261532_2625
11/07/28 17:20:29 INFO mapred.JobClient: Counters: 8
11/07/28 17:20:29 INFO mapred.JobClient: Job Counters
11/07/28 17:20:29 INFO mapred.JobClient: SLOTS_MILLIS_MAPS=1504081
11/07/28 17:20:29 INFO mapred.JobClient: Total time spent by all reduces
waiting after reserving slots (ms)=0
11/07/28 17:20:29 INFO mapred.JobClient: Total time spent by all maps
waiting after reserving slots (ms)=0
11/07/28 17:20:29 INFO mapred.JobClient: Rack-local map tasks=187
11/07/28 17:20:29 INFO mapred.JobClient: Launched map tasks=350
11/07/28 17:20:29 INFO mapred.JobClient: Data-local map tasks=163
11/07/28 17:20:29 INFO mapred.JobClient: SLOTS_MILLIS_REDUCES=0
11/07/28 17:20:29 INFO mapred.JobClient: Failed map tasks=1
11/07/28 17:20:29 INFO mapred.JobClient: Job Failed: NA
Exception in thread "main" java.io.IOException: Job failed!
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1246)
at LoadToHBase.run(LoadToHBase.java:106)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at LoadToHBase.main(LoadToHBase.java:91)
why it cannot find XMap, it's a inner class, it should be found ... I am
really confused with this situation... thank you for you help
--
Knowledge Mangement .
--
Knowledge Mangement .
