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From Devin Suiter RDX <dsui...@rdx.com>
Subject Re: Hadoop permissions issue
Date Mon, 06 Jan 2014 13:43:47 GMT
Based on the Exception type, it looks like something in your job is looking
for a valid value, and not finding it.

You will probably need to share the job code for people to help with this -
to my eyes, this doesn't appear to be a Hadoop configuration issue, or any
kind of problem with how the system is working.

Are you using Avro inputs and outputs? If your reduce is trying to parse an
Avro record, it may be that the field type is not correct, or maybe there
is a reference to an outside schema object that is not available...

If you provide more information about the context of the error (use case,
program goal, code block, something like that) then it is easier to help

*Devin Suiter*
Jr. Data Solutions Software Engineer
100 Sandusky Street | 2nd Floor | Pittsburgh, PA 15212
Google Voice: 412-256-8556 | www.rdx.com

On Mon, Jan 6, 2014 at 8:08 AM, Manikandan Saravanan <
manikandan@thesocialpeople.net> wrote:

> I’m trying to run Nutch 2.2.1 on a Hadoop 1.2.1 cluster. The fetch phase
> runs fine. But in the next job, this error comes up
> java.lang.NullPointerException
> at org.apache.avro.util.Utf8.<init>(Utf8.java:37)
> at org.apache.nutch.crawl.GeneratorReducer.setup(GeneratorReducer.java:100)
> at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:174)
> at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:649)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:418)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
> at org.apache.hadoop.mapred.Child.main(Child.java:249)
> I’m running three nodes namely nutch1,2,3. The first one’s in the masters
> file and all are listed in the slaves file. The /etc/hosts file lists all
> machines along with their IP addresses. Can someone help me?
> --
> Manikandan Saravanan
> Architect - Technology
> TheSocialPeople <http://thesocialpeople.net>

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