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From "Sanchita Adhya" <sad...@infocepts.com>
Subject Error using MultipleInputs
Date Thu, 05 Jul 2012 11:49:38 GMT
Hi,

 

I am using cloudera's hadoop version - Hadoop 0.20.2-cdh3u3 and trying to
use the MultipleInputs incorporating separate mapper class in the following
manner-

 

public static void main(String[] args) throws Exception {

     JobConf conf = new JobConf(IntegrateExisting.class);

     conf.setJobName("IntegrateExisting");

 

     conf.setOutputKeyClass(Text.class);

     conf.setOutputValueClass(Text.class);

 

     Path existingKeysInputPath = new Path(args[0]);

     Path newKeysInputPath = new Path(args[1]);

    Path outputPath = new Path(args[2]);

 

     MultipleInputs.addInputPath(conf, existingKeysInputPath,
TextInputFormat.class, MapExisting.class);

     MultipleInputs.addInputPath(conf, newKeysInputPath,
TextInputFormat.class, MapNew.class);

    

     conf.setCombinerClass(ReduceAndFilterOut.class);

     conf.setReducerClass(ReduceAndFilterOut.class);

     

     conf.setInputFormat(TextInputFormat.class);

     conf.setOutputFormat(TextOutputFormat.class);

 

     FileOutputFormat.setOutputPath(conf, outputPath);

 

 

    //FileInputFormat.addInputPath(conf,existingKeysInputPath);

   //FileInputFormat.addInputPath(conf,newKeysInputPath);

 

     JobClient.runJob(conf);

   }

 

Without the commented lines in the above code, the MR job fails with the
following error-

 

12/07/05 16:59:25 ERROR security.UserGroupInformation:
PriviledgedActionException as:root (auth:SIMPLE) cause:java.io.IOException:
No input paths specified in job

Exception in thread "main" java.io.IOException: No input paths specified in
job

        at
org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:153
)

        at
org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:205)

        at
org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:971)

        at
org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:963)

        at org.apache.hadoop.mapred.JobClient.access$500(JobClient.java:170)

        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:880)

        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:833)

        at java.security.AccessController.doPrivileged(Native Method)

        at javax.security.auth.Subject.doAs(Subject.java:396)

        at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.ja
va:1157)

        at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:833)

        at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:807)

        at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1242)

        at org.myorg.IntegrateExisting.main(IntegrateExisting.java:122)

        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.RunJar.main(RunJar.java:197)

 

Uncommenting the lines, leads to the following error in the mappers-

 

java.lang.ClassCastException: org.apache.hadoop.mapred.FileSplit cannot be
cast to org.apache.hadoop.mapred.lib.TaggedInputSplit

        at
org.apache.hadoop.mapred.lib.DelegatingMapper.map(DelegatingMapper.java:48)

        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)

        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:391)

        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.ja
va:1157)

        at org.apache.hadoop.mapred.Child.main(Child.java:264)

 

I see the MAPREDUCE-1178 that discusses the second error is included in the
CDH3 version. Is there any code missing from the above piece?

 

Thanks for the help. 

 

Regards,

Sanchita

 


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