hi,

it is Hadoop 2.0.0-cdh4.1.1. the whole output is given below:

Hadoop 2.0.0-cdh4.1.1
Subversion
file:///data/1/jenkins/workspace/generic-package-centos32-6/topdir/BUILD/hadoop-2.0.0-cdh4.1.1/src/hadoop-common-project/hadoop-common-r
581959ba23e4af85afd8db98b7687662fe9c5f20

On Fri, Feb 8, 2013 at 12:04 AM, Harsh J <[EMAIL PROTECTED]> wrote:

> Hey Ravi,
>
> What version of Hadoop is this exactly? (Type and send output of
> "hadoop version" if unsure)
>
> On Thu, Feb 7, 2013 at 11:55 PM, Ravi Chandran
> <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > I am trying to do a name sorting using secondary sort. I have a working
> > example, which I am taking as a reference. But I am getting a null
> pointer
> > error in the MapTask class. I am not able to locate the reason. as the
> logic
> > to create the Custom Object from a given file has been tested through a
> java
> > class..
> > I am getting this error:
> >
> > 13/02/07 12:23:42 WARN snappy.LoadSnappy: Snappy native library is
> available
> > 13/02/07 12:23:42 INFO snappy.LoadSnappy: Snappy native library loaded
> > 13/02/07 12:23:42 INFO mapred.FileInputFormat: Total input paths to
> process
> > : 1
> > 13/02/07 12:23:43 INFO mapred.JobClient: Running job:
> job_201301301056_0014
> > 13/02/07 12:23:44 INFO mapred.JobClient:  map 0% reduce 0%
> > 13/02/07 12:23:56 INFO mapred.JobClient: Task Id :
> > attempt_201301301056_0014_m_000000_0, Status : FAILED
> > java.lang.NullPointerException
> >  at
> > org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:814)
> >  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:385)
> >  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
> >  at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
> >  at java.security.AccessController.doPrivileged(Native Method)
> >  at javax.security.auth.Subject.doAs(Subject.java:396)
> >  at
> >
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332)
> >  at org.apache.hadoop.mapred.Child.main(Child.java:262)
> > 13/02/07 12:23:57 INFO mapred.JobClient: Task Id :
> > attempt_201301301056_0014_m_000001_0, Status : FAILED
> > java.lang.NullPointerException
> >  at
> > org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:814)
> >  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:385)
> >  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
> >  at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
> >  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:1332)
> >  at org.apache.hadoop.mapred.Child.main(Child.java:262)
> >
> > I am giving the Mapper code below:
> >
> > import java.io.IOException;
> > import org.apache.hadoop.io.LongWritable;
> > import org.apache.hadoop.io.Text;
> > 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.log4j.Logger;
> > import com.pom.Name;
> >
> > public class StubMapper extends MapReduceBase implements
> >     Mapper<LongWritable, Text, Name, Text> {
> >
> >   private static Logger logger > >     Logger.getLogger(StubMapper.class.getName());
> >
> >  StringBuffer readLine = new StringBuffer();
> >   private final Name name = new Name();
> >   @Override
> >   public void map(LongWritable key, Text value,
> >       OutputCollector<Name, Text> output, Reporter reporter)
> >       throws IOException {
> >     String line = value.toString();
> >     String[] packer = null;
> >
> >     packer = line.split(" ");
> >
> >     // create the object
> >  if(packer.length>2)
> >  {
> >   // take everything except last name
> >   for (int i = 0; i < packer.length-1; i++) {
> >    readLine.append(packer[i]+" ");
> >   }
> >
> >   name.setfName(readLine.toString());

Thanks & Regards
Ravi

The JIRA https://issues.apache.org/jira/browse/MAPREDUCE-2584 should
help such cases, if what I speculated above is indeed the case.

On Fri, Feb 8, 2013 at 12:16 AM, Harsh J <[EMAIL PROTECTED]> wrote:
> Thanks, I managed to correlate proper line numbers.
>
> Are you using some form of custom serialization in your job code? That
> is, are your keys non-Writable types and are of some other type? The
> specific NPE is arising from the SerializationFactory not being able
> to find a serializer for your Map-Output key class. You may want to
> look into that direction, or share your code for the list to spot it
> instead.
>
> On Fri, Feb 8, 2013 at 12:11 AM, Ravi Chandran
> <[EMAIL PROTECTED]> wrote:
>> hi,
>>
>> it is Hadoop 2.0.0-cdh4.1.1. the whole output is given below:
>>
>> Hadoop 2.0.0-cdh4.1.1
>> Subversion
>> file:///data/1/jenkins/workspace/generic-package-centos32-6/topdir/BUILD/hadoop-2.0.0-cdh4.1.1/src/hadoop-common-project/hadoop-common
>> -r 581959ba23e4af85afd8db98b7687662fe9c5f20
>>
>>
>>
>> On Fri, Feb 8, 2013 at 12:04 AM, Harsh J <[EMAIL PROTECTED]> wrote:
>>>
>>> Hey Ravi,
>>>
>>> What version of Hadoop is this exactly? (Type and send output of
>>> "hadoop version" if unsure)
>>>
>>> On Thu, Feb 7, 2013 at 11:55 PM, Ravi Chandran
>>> <[EMAIL PROTECTED]> wrote:
>>> > Hi,
>>> >
>>> > I am trying to do a name sorting using secondary sort. I have a working
>>> > example, which I am taking as a reference. But I am getting a null
>>> > pointer
>>> > error in the MapTask class. I am not able to locate the reason. as the
>>> > logic
>>> > to create the Custom Object from a given file has been tested through a
>>> > java
>>> > class..
>>> > I am getting this error:
>>> >
>>> > 13/02/07 12:23:42 WARN snappy.LoadSnappy: Snappy native library is
>>> > available
>>> > 13/02/07 12:23:42 INFO snappy.LoadSnappy: Snappy native library loaded
>>> > 13/02/07 12:23:42 INFO mapred.FileInputFormat: Total input paths to
>>> > process
>>> > : 1
>>> > 13/02/07 12:23:43 INFO mapred.JobClient: Running job:
>>> > job_201301301056_0014
>>> > 13/02/07 12:23:44 INFO mapred.JobClient:  map 0% reduce 0%
>>> > 13/02/07 12:23:56 INFO mapred.JobClient: Task Id :
>>> > attempt_201301301056_0014_m_000000_0, Status : FAILED
>>> > java.lang.NullPointerException
>>> >  at
>>> >
>>> > org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:814)
>>> >  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:385)
>>> >  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
>>> >  at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
>>> >  at java.security.AccessController.doPrivileged(Native Method)
>>> >  at javax.security.auth.Subject.doAs(Subject.java:396)
>>> >  at
>>> >
>>> > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332)
>>> >  at org.apache.hadoop.mapred.Child.main(Child.java:262)
>>> > 13/02/07 12:23:57 INFO mapred.JobClient: Task Id :
>>> > attempt_201301301056_0014_m_000001_0, Status : FAILED
>>> > java.lang.NullPointerException
>>> >  at
>>> >
>>> > org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:814)
>>> >  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:385)
>>> >  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
>>> >  at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
>>> >  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:1332)
>>> >  at org.apache.hadoop.mapred.Child.main(Child.java:262)
>>> >
>>> > I am giving the Mapper code below:
>>> >
>>> > import java.io.IOException;
>>> > import org.apache.hadoop.io.LongWritable;
>>> > import org.apache.hadoop.io.Text;
>>> > import org.apache.hadoop.mapred.MapReduceBase;
>>> > import org.apache.hadoop.mapred.Mapper;
>>> > import org.apache.hadoop.mapred.OutputCollector;
>>> > import org.apache.hadoop.mapred.Reporter;

Harsh J

unsubscribe

On 08/02/13 12:19 AM, "Harsh J" <[EMAIL PROTECTED]> wrote:

>The JIRA https://issues.apache.org/jira/browse/MAPREDUCE-2584 should
>help such cases, if what I speculated above is indeed the case.
>
>On Fri, Feb 8, 2013 at 12:16 AM, Harsh J <[EMAIL PROTECTED]> wrote:
>> Thanks, I managed to correlate proper line numbers.
>>
>> Are you using some form of custom serialization in your job code? That
>> is, are your keys non-Writable types and are of some other type? The
>> specific NPE is arising from the SerializationFactory not being able
>> to find a serializer for your Map-Output key class. You may want to
>> look into that direction, or share your code for the list to spot it
>> instead.
>>
>> On Fri, Feb 8, 2013 at 12:11 AM, Ravi Chandran
>> <[EMAIL PROTECTED]> wrote:
>>> hi,
>>>
>>> it is Hadoop 2.0.0-cdh4.1.1. the whole output is given below:
>>>
>>> Hadoop 2.0.0-cdh4.1.1
>>> Subversion
>>>
>>>file:///data/1/jenkins/workspace/generic-package-centos32-6/topdir/BUILD
>>>/hadoop-2.0.0-cdh4.1.1/src/hadoop-common-project/hadoop-common
>>> -r 581959ba23e4af85afd8db98b7687662fe9c5f20
>>>
>>>
>>>
>>> On Fri, Feb 8, 2013 at 12:04 AM, Harsh J <[EMAIL PROTECTED]> wrote:
>>>>
>>>> Hey Ravi,
>>>>
>>>> What version of Hadoop is this exactly? (Type and send output of
>>>> "hadoop version" if unsure)
>>>>
>>>> On Thu, Feb 7, 2013 at 11:55 PM, Ravi Chandran
>>>> <[EMAIL PROTECTED]> wrote:
>>>> > Hi,
>>>> >
>>>> > I am trying to do a name sorting using secondary sort. I have a
>>>>working
>>>> > example, which I am taking as a reference. But I am getting a null
>>>> > pointer
>>>> > error in the MapTask class. I am not able to locate the reason. as
>>>>the
>>>> > logic
>>>> > to create the Custom Object from a given file has been tested
>>>>through a
>>>> > java
>>>> > class..
>>>> > I am getting this error:
>>>> >
>>>> > 13/02/07 12:23:42 WARN snappy.LoadSnappy: Snappy native library is
>>>> > available
>>>> > 13/02/07 12:23:42 INFO snappy.LoadSnappy: Snappy native library
>>>>loaded
>>>> > 13/02/07 12:23:42 INFO mapred.FileInputFormat: Total input paths to
>>>> > process
>>>> > : 1
>>>> > 13/02/07 12:23:43 INFO mapred.JobClient: Running job:
>>>> > job_201301301056_0014
>>>> > 13/02/07 12:23:44 INFO mapred.JobClient:  map 0% reduce 0%
>>>> > 13/02/07 12:23:56 INFO mapred.JobClient: Task Id :
>>>> > attempt_201301301056_0014_m_000000_0, Status : FAILED
>>>> > java.lang.NullPointerException
>>>> >  at
>>>> >
>>>> >
>>>>org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:81
>>>>4)
>>>> >  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:385)
>>>> >  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
>>>> >  at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
>>>> >  at java.security.AccessController.doPrivileged(Native Method)
>>>> >  at javax.security.auth.Subject.doAs(Subject.java:396)
>>>> >  at
>>>> >
>>>> >
>>>>org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformati
>>>>on.java:1332)
>>>> >  at org.apache.hadoop.mapred.Child.main(Child.java:262)
>>>> > 13/02/07 12:23:57 INFO mapred.JobClient: Task Id :
>>>> > attempt_201301301056_0014_m_000001_0, Status : FAILED
>>>> > java.lang.NullPointerException
>>>> >  at
>>>> >
>>>> >
>>>>org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:81
>>>>4)
>>>> >  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:385)
>>>> >  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
>>>> >  at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
>>>> >  at java.security.AccessController.doPrivileged(Native Method)
>>>> >  at javax.security.auth.Subject.doAs(Subject.java:396)
>>>> >  at
>>>> >
>>>> >
>>>>org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformati
>>>>on.java:1332)
>>>> >  at org.apache.hadoop.mapred.Child.main(Child.java:262)
>>>> >
>>>> > I am giving the Mapper code below:
>>>> >
>>>> > import java.io.IOException;
>>>> > import org.apache.hadoop.io.LongWritable;