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Error: java.net.MalformedURLException: unknown protocol: hdfs

Error: java.net.MalformedURLException: unknown protocol: hdfs

Explorer

I m using hadoop-2.7.2. using CentOS-7 (64 Bit). Trying to extract the pdf file using apache-tika. when i execute this code on eclipse i m able extacted file then i created a jar and exceuted that jar on hadoop in ubuntu machine its also work fine.but when i used that jar in ambari installed hadoop with same code. i m getting this error Error: java.net.MalformedURLException: unknown protocol: hdfs. i don't understand why its not working.i tried alot to resolve this issue but failed. plz someone help me.

this is my code

package tikka.com;


import java.io.IOException;
import java.net.URL;
import java.util.Date;


import org.apache.commons.compress.utils.IOUtils.*;
import org.tukaani.xz.ARMOptions.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;


public class TikaMapreduce extends Configured implements Tool
{
	public static class TikaMapper extends Mapper<Text, Text, Text, Text> 
	{
		public void map(Text key, Text value, Context context)
				throws IOException, InterruptedException 
		{
			context.write(key, value);
		}
	}


	public static void main(String[] args) throws Exception 
	{
		
		int exit = ToolRunner.run(new Configuration(), new TikaMapreduce(),
				args);
		System.exit(exit);
	}


	
	@Override
	public int run(String[] args) throws Exception 
	{
		
		Configuration conf = new Configuration();
		FileSystem hdfs = FileSystem.get(conf);
		URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());
		Job job = new Job(conf, "TikaMapreduce");
		job.setJarByClass(getClass());
		job.setJobName("TikRead");
		job.setInputFormatClass(TikaFileInputFormat.class);
		System.out.println("read input file");
		FileInputFormat.addInputPath(job, new Path("hdfs://hostname:8020/input-data/pwc-canada-issues-reporting-form.pdf"));
		job.setMapperClass(TikaMapper.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(Text.class);
		job.setOutputFormatClass(TikaOutPutFormt.class);
		FileOutputFormat.setOutputPath(job, new Path("hdfs://hostname:8020/output-data/pdfoutput"+(new Date().getTime())));
		System.out.println("output pdf");
		return job.waitForCompletion(true) ? 0 : 1;
	}
}

package tikka.com;


import java.io.IOException;


import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;


public class TikaFileInputFormat extends FileInputFormat<Text, Text>
{
	@Override
	public RecordReader<Text, Text> createRecordReader(InputSplit split,
			TaskAttemptContext context) throws IOException, InterruptedException {
		// TODO Auto-generated method stub
		//return new TikaRecordReader();
		return new TikaRecordReader();
	}
}
package tikka.com;


import java.io.IOException;


import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;


public class TikaOutPutFormt extends FileOutputFormat<Text, Text>
{
	@Override
	public RecordWriter<Text, Text> getRecordWriter(TaskAttemptContext context)
			throws IOException, InterruptedException {
		// TODO Auto-generated method stub
		Path path=FileOutputFormat.getOutputPath(context);
		Path fullapth=new Path(path,"PDF.txt");
		FileSystem fs=path.getFileSystem(context.getConfiguration());
		FSDataOutputStream output=fs.create(fullapth,context);
		return new TikaRecordWrite(output);
	}
}
package tikka.com;


import java.io.IOException;
import java.net.URL;


import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.tika.Tika;
import org.apache.tika.exception.TikaException;


public class TikaRecordReader extends RecordReader<Text, Text>
{
	private Text key = new Text();
	private Text value = new Text();
	private FileSplit fileSplit;
	private Configuration conf;
	private boolean processed = false;


	@Override
	public void close() throws IOException 
	{
		// TODO Auto-generated method stub


	}


	@Override
	public Text getCurrentKey() throws IOException, InterruptedException 
	{
		// TODO Auto-generated method stub
		return key;
	}


	@Override
	public Text getCurrentValue() throws IOException, InterruptedException 
	{
		// TODO Auto-generated method stub
		return value;
	}


	@Override
	public float getProgress() throws IOException, InterruptedException 
	{
		// TODO Auto-generated method stub
		return processed ? 1.0f : 0.0f;
	}


	@Override
	public void initialize(InputSplit split, TaskAttemptContext context)
			throws IOException, InterruptedException 
	{
		// TODO Auto-generated method stub
		this.fileSplit = (FileSplit) split;
		this.conf = context.getConfiguration();
	}


	@Override
	public boolean nextKeyValue() throws IOException, InterruptedException 
	{
		// TODO Auto-generated method stub
		if (!processed) {
			Path path = fileSplit.getPath();
			key.set(path.toString());
			@SuppressWarnings("unused")
			FileSystem fs = path.getFileSystem(conf);
			@SuppressWarnings("unused")
			FSDataInputStream fin = null;


			try 
			{
				String con = new Tika().parseToString(new URL(path.toString()));
				String string = con.replaceAll("[$%&+,:;=?#|']", " ");
				String string2 = string.replaceAll("\\s+", " ");
				String lo = string2.toLowerCase();
				value.set(lo);
			} catch (TikaException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			processed = true;
			return true;
		} 
		else 
		{
			return false;


		}


	}


}
package tikka.com;


import java.io.DataOutputStream;
import java.io.IOException;


import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;


public class TikaRecordWrite extends RecordWriter<Text, Text>
{
	private DataOutputStream out;
	public TikaRecordWrite(DataOutputStream output) {
		// TODO Auto-generated constructor stub
		out=output;
		try {
			out.writeBytes("result:\r\n");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}


	@Override
	public void close(TaskAttemptContext context) throws IOException,
			InterruptedException {
		// TODO Auto-generated method stub
             out.close();
	}


	@Override
	public void write(Text key, Text value) throws IOException,
			InterruptedException {
		// TODO Auto-generated method stub
             out.writeBytes(key.toString());
             out.writeBytes(",");
             out.writeBytes(value.toString());
             out.writeBytes("\r\n"); 
	}
}

output after executed jar file

read input file
output pdf
17/06/28 02:29:10 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
17/06/28 02:29:11 WARN mapreduce.JobResourceUploader: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
17/06/28 02:29:12 INFO input.FileInputFormat: Total input paths to process : 1
17/06/28 02:29:12 INFO mapreduce.JobSubmitter: number of splits:1
17/06/28 02:29:12 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1498630846170_0002
17/06/28 02:29:13 INFO impl.YarnClientImpl: Submitted application application_1498630846170_0002
17/06/28 02:29:13 INFO mapreduce.Job: The url to track the job: https://hostname:8088/proxy/application_1498630846170_0002/
17/06/28 02:29:13 INFO mapreduce.Job: Running job: job_1498630846170_0002
17/06/28 02:29:23 INFO mapreduce.Job: Job job_1498630846170_0002 running in uber mode : false
17/06/28 02:29:23 INFO mapreduce.Job:  map 0% reduce 0%
17/06/28 02:29:51 INFO mapreduce.Job: Task Id : attempt_1498630846170_0002_m_000000_0, Status : FAILED
Error: java.net.MalformedURLException: unknown protocol: hdfs
	at java.net.URL.<init>(URL.java:600)
	at java.net.URL.<init>(URL.java:490)
	at java.net.URL.<init>(URL.java:439)
	at tikka.com.TikaRecordReader.nextKeyValue(TikaRecordReader.java:77)
	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:556)
	at org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80)
	at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)


17/06/28 02:30:09 INFO mapreduce.Job: Task Id : attempt_1498630846170_0002_m_000000_1, Status : FAILED
Error: java.net.MalformedURLException: unknown protocol: hdfs
	at java.net.URL.<init>(URL.java:600)
	at java.net.URL.<init>(URL.java:490)
	at java.net.URL.<init>(URL.java:439)
	at tikka.com.TikaRecordReader.nextKeyValue(TikaRecordReader.java:77)
	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:556)
	at org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80)
	at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)


17/06/28 02:30:24 INFO mapreduce.Job: Task Id : attempt_1498630846170_0002_m_000000_2, Status : FAILED
Error: java.net.MalformedURLException: unknown protocol: hdfs
	at java.net.URL.<init>(URL.java:600)
	at java.net.URL.<init>(URL.java:490)
	at java.net.URL.<init>(URL.java:439)
	at tikka.com.TikaRecordReader.nextKeyValue(TikaRecordReader.java:77)
	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:556)
	at org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80)
	at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)


17/06/28 02:30:39 INFO mapreduce.Job:  map 100% reduce 0%
17/06/28 02:30:40 INFO mapreduce.Job:  map 100% reduce 100%
17/06/28 02:30:44 INFO mapreduce.Job: Job job_1498630846170_0002 failed with state FAILED due to: Task failed task_1498630846170_0002_m_000000
Job failed as tasks failed. failedMaps:1 failedReduces:0


17/06/28 02:30:44 INFO mapreduce.Job: Counters: 13
	Job Counters 
		Failed map tasks=4
		Killed reduce tasks=1
		Launched map tasks=4
		Other local map tasks=3
		Data-local map tasks=1
		Total time spent by all maps in occupied slots (ms)=67789
		Total time spent by all reduces in occupied slots (ms)=0
		Total time spent by all map tasks (ms)=67789
		Total time spent by all reduce tasks (ms)=0
		Total vcore-milliseconds taken by all map tasks=67789
		Total vcore-milliseconds taken by all reduce tasks=0
		Total megabyte-milliseconds taken by all map tasks=69415936
		Total megabyte-milliseconds taken by all reduce tasks=0


thank in advance.

6 REPLIES 6

Re: Error: java.net.MalformedURLException: unknown protocol: hdfs

Explorer

Is that the same distribution hadoop version between CentOS and Ubuntu?

Re: Error: java.net.MalformedURLException: unknown protocol: hdfs

Explorer

on ubuntu used hadoop-2.7.3 version and in centos used hadoop-2.7.2 version.

Re: Error: java.net.MalformedURLException: unknown protocol: hdfs

Super Mentor

@zahain

It might be a hdfs client jar / classpath issue.

Can you please check if your classpath is pointing to correct Hadoop jars?

You can also use the "hadop classpath" command output to find the classpath to be used.

Example:

# javac -cp `hadoop classpath`  -d  TikaMapreduce.java
# java -cp `hadoop classpath`:.:  tikka.com.TikaMapreduce.java

.

You can also add your own JAR directories in the classpath like:

 -cp `hadoop classpath`:$YOUR/LIB/PATH:.:

.

Highlighted

Re: Error: java.net.MalformedURLException: unknown protocol: hdfs

Explorer

i have set this way of my classpath. Is this right way? if i m wrong plz guide me for right way.

export HADOOP_CLASSPATH=/opt/hadoop/etc/hadoop:/opt/hadoop/share/hadoop/common/lib/*:/opt/hadoop/share/hadoop/common/*:/opt/hadoop/share/hadoop/hdfs:/opt/hadoop/share/hadoop/hdfs/lib/*:/opt/hadoop/share/hadoop/hdfs/*:/opt/hadoop/share/hadoop/yarn/lib/*:/opt/hadoop/share/hadoop/yarn/*:/opt/hadoop/share/hadoop/mapreduce/lib/*:/opt/hadoop/share/hadoop/mapreduce/*:/opt/hadoop/etc/hadoop:/opt/hadoop/share/hadoop/common/lib/*:/opt/hadoop/share/hadoop/common/*:/opt/hadoop/share/hadoop/hdfs:/opt/hadoop/share/hadoop/hdfs/lib/*:/opt/hadoop/share/hadoop/hdfs/*:/opt/hadoop/share/hadoop/yarn/lib/*:/opt/hadoop/share/hadoop/yarn/*:/opt/hadoop/share/hadoop/mapreduce/lib/*:/opt/hadoop/share/hadoop/mapreduce/*:/opt/hadoop/share/hadoop/*::/opt/hadoop/contrib/capacity-scheduler/*.jar


Re: Error: java.net.MalformedURLException: unknown protocol: hdfs

Super Mentor

@zahain

Can you please try like this:

#### First check if the `hadoop classpath` is returning proper results.
# hadoop classpath

#### If yes, then set the CLASSPATH as following. 
#### Please NOTE the value is in back tick `` Not single quote ''
# export CLASSPATH=`hadoop classpath`

.

Also please note that the "HADOOP_CLASSPATH" variable is normally used by the standard hadoop scripts, But for your standalone java code you should set the value in CLASSPATH variable instead.

.

Re: Error: java.net.MalformedURLException: unknown protocol: hdfs

Explorer

yes i got the result.you can see.

[hdusr@vfarm01d hadoop]$ hadoop classpath
/opt/hadoop/etc/hadoop:/opt/hadoop/share/hadoop/common/lib/*:/opt/hadoop/share/hadoop/common/*:/opt/hadoop/share/hadoop/hdfs:/opt/hadoop/share/hadoop/hdfs/lib/*:/opt/hadoop/share/hadoop/hdfs/*:/opt/hadoop/share/hadoop/yarn/lib/*:/opt/hadoop/share/hadoop/yarn/*:/opt/hadoop/share/hadoop/mapreduce/lib/*:/opt/hadoop/share/hadoop/mapreduce/*:/opt/hadoop/contrib/capacity-scheduler/*.jar


and i have set as you said

export CLASSPATH=`hadoop classpath`

but still getting same error.

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