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テキストファイルをORC形式に変換するマップリダクションコードを作成しています.hive-exec-0.13.0 jarに存在するORCNewOutputFormatが使用されています。 15ノードクラスタ（hdp 2.3）。問題は私のマップリダクションコードでアクセスする外部jar（hive-exec-0.13.0.jar）をロードできないことです。私はlibjarsや分散キャッシュのような他の方法も試しましたが、コードはjar.Asにアクセスできませんでした。これを行うための他の方法はありますか？マップを使用してテキストファイルをorc形式に変換する
//Driver Code
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.io.orc.OrcNewOutputFormat;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
public class Driver {
public static void main(String args[]) throws IOException, InterruptedException, ClassNotFoundException
{
Configuration conf =new Configuration();
Job job =new Job(conf,"join");
job.setJarByClass(Driver.class);
job.setReducerClass(ReducerORC.class);
job.setMapperClass(MapORC.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
job.setOutputKeyClass(NullWritable.class);
job.setOutputValueClass(Writable.class);
conf.set("orc.create.index","true");
OrcNewOutputFormat.setCompressOutput(job,true);
OrcNewOutputFormat.setOutputPath(job,new Path(args[1]));
FileInputFormat.addInputPath(job,new Path(args[0]));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
。
//Mapper Code
import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer.Context;
public class MapORC extends Mapper<LongWritable, Text, Text, Text>
{
@Override
public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException
{
String [] split=value.toString().split(",",2);
String id = split[0];
String others= split[1];
context.write(new Text(id),new Text(others));
}
}
。
//Reducer Code
import java.util.ArrayList;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.io.orc.OrcSerde;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.Mapper.Context;
public class ReducerORC extends Reducer<Text,Text,NullWritable,Writable> {
private final OrcSerde orcSerde = new OrcSerde();
private Writable row;
private final String Struct1 = "struct<name:string,age:String>";
private final TypeInfo ReduceTypeInfo = TypeInfoUtils.getTypeInfoFromTypeString(Struct1);
private final ObjectInspector ins = TypeInfoUtils.getStandardJavaObjectInspectorFromTypeInfo(ReduceTypeInfo);
@Override
protected void reduce(Text key,Iterable<Text> values, Context context) {
List <Text> orcRecord = new ArrayList<Text>();
orcRecord.add(key);
for(Text value:values)
{
orcRecord.add(value);
}
this.row = orcSerde.serialize(orcRecord, ins);
try {
context.write(NullWritable.get(), this.row);
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
。上記のコード
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/hive/ql/io/orc/OrcNewOutputFormat
at Driver.main(Driver.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hive.ql.io.orc.OrcNewOutputFormat
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 7 more