Databases
StackOverflow2013
Postsdbo
POError: no classes specified
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POError: no classes specified
    primarykey
    data
    text
    <p>I wrote this Java hadoop program which will execute parallel indexation of files.The file was created in eclipse</p> <pre><code>package org.myorg; import java.io.*; import java.util.*; import org.apache.hadoop.fs.Path; import org.apache.hadoop.conf.*; import org.apache.hadoop.io.*; import org.apache.hadoop.mapred.*; import org.apache.hadoop.util.*; public class ParallelIndexation { public static class Map extends MapReduceBase implements Mapper&lt;LongWritable, Text, Text, IntWritable&gt; { private final static IntWritable zero = new IntWritable(0); private Text word = new Text(); public void map(LongWritable key, Text value, OutputCollector&lt;Text, IntWritable&gt; output, Reporter reporter) throws IOException { String line = value.toString(); int CountComputers; //DataInputStream ConfigFile = new DataInputStream( new FileInputStream("countcomputers.txt")); FileInputStream fstream = new FileInputStream("/usr/countcomputers.txt"); // путь к файлу DataInputStream in = new DataInputStream(fstream); BufferedReader br = new BufferedReader(new InputStreamReader(in)); String result = br.readLine(); // читаем как строку CountComputers = Integer.parseInt(result); // переводим строку в число //CountComputers=ConfigFile.readInt(); in.close(); fstream.close(); ArrayList&lt;String&gt; paths = new ArrayList&lt;String&gt;(); StringTokenizer tokenizer = new StringTokenizer(line, "\n"); while (tokenizer.hasMoreTokens()) { paths.add(tokenizer.nextToken()); } String[] ConcatPaths= new String[CountComputers]; int NumberOfElementConcatPaths=0; if (paths.size()%CountComputers==0) { for (int i=0; i&lt;CountComputers; i++) { ConcatPaths[i]=paths.get(NumberOfElementConcatPaths); NumberOfElementConcatPaths+=paths.size()/CountComputers; for (int j=1; j&lt;paths.size()/CountComputers; j++) { ConcatPaths[i]+="\n"+paths.get(i*paths.size()/CountComputers+j); } } } else { NumberOfElementConcatPaths=0; for (int i=0; i&lt;paths.size()%CountComputers; i++) { ConcatPaths[i]=paths.get(NumberOfElementConcatPaths); NumberOfElementConcatPaths+=paths.size()/CountComputers+1; for (int j=1; j&lt;paths.size()/CountComputers+1; j++) { ConcatPaths[i]+="\n"+paths.get(i*(paths.size()/CountComputers+1)+j); } } for (int k=paths.size()%CountComputers; k&lt;CountComputers; k++) { ConcatPaths[k]=paths.get(NumberOfElementConcatPaths); NumberOfElementConcatPaths+=paths.size()/CountComputers; for (int j=1; j&lt;paths.size()/CountComputers; j++) { ConcatPaths[k]+="\n"+paths.get((k-paths.size()%CountComputers)*paths.size()/CountComputers+paths.size()%CountComputers*(paths.size()/CountComputers+1)+j); } } } //CountComputers=ConfigFile.readInt(); for (int i=0; i&lt;ConcatPaths.length; i++) { word.set(ConcatPaths[i]); output.collect(word, zero); } } } public static class Reduce extends MapReduceBase implements Reducer&lt;Text, IntWritable, Text, LongWritable&gt; { public native long Traveser(String Path); public native void Configure(String Path); public void reduce(Text key, &lt;Iterator&gt;IntWritable value, OutputCollector&lt;Text, LongWritable&gt; output, Reporter reporter) throws IOException { long count; String line = key.toString(); ArrayList&lt;String&gt; ProcessedPaths = new ArrayList&lt;String&gt;(); StringTokenizer tokenizer = new StringTokenizer(line, "\n"); while (tokenizer.hasMoreTokens()) { ProcessedPaths.add(tokenizer.nextToken()); } Configure("/etc/nsindexer.conf"); for (int i=0; i&lt;ProcessedPaths.size(); i++) { count=Traveser(ProcessedPaths.get(i)); } output.collect(key, new LongWritable(count)); } static { System.loadLibrary("nativelib"); } } public static void main(String[] args) throws Exception { JobConf conf = new JobConf(ParallelIndexation.class); conf.setJobName("parallelindexation"); conf.setOutputKeyClass(Text.class); conf.setOutputValueClass(LongWritable.class); conf.setMapperClass(Map.class); conf.setCombinerClass(Reduce.class); conf.setReducerClass(Reduce.class); conf.setInputFormat(TextInputFormat.class); conf.setOutputFormat(TextOutputFormat.class); FileInputFormat.setInputPaths(conf, new Path(args[0])); FileOutputFormat.setOutputPath(conf, new Path(args[1])); JobClient.runJob(conf); } } </code></pre> <p>I compiled the program by means of a command</p> <pre><code>javac -classpath /export/hadoop-1.0.1/hadoop-core-1.0.1.jar -d folder/classes folder/src/ParallelIndexation.java, root@one:/export/hadoop-1.0.1/folder/classes# jar -cvf ParallelIndexation.jar -C /export/hadoop-1.0.1/folder/classes </code></pre> <p>Then for native methods I tried to create the .h file</p> <pre><code>root@one:/export/hadoop-1.0.1/folder/classes# javah -classpath /export/hadoop-1.0.1/hadoop-core-1.0.1.jar;/export/hadoop-1.0.1/folder/classes/ParallelIndexation.jar -jni org.myorg.ParallelIndexation </code></pre> <p>received the following mistake</p> <pre><code>Error: no classes specified bash: /export/hadoop-1.0.1/folder/classes/ParallelIndexation.jar: Permission denied </code></pre> <p>thus on ParallelIndexation.jar the rights 0777 are set</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USuser1730626
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload