unable to figure out this exception from reduce task

I am using hadoop 0.15.1 to index some catalog that has a
tree-like
structure, where the leaf nodes are data files.  My main
task is a
loop that performs a breadth-first walkthrough that parses
out URLs to
catalogs and datafiles at the next level, which is done in a
mapper.
To determine when the loop should terminate, I use a reduce
task that
counts the number of new catalogs found, and stops the loop
when the
count is 0.

But while I was running the jobs, I kept getting this
exception
(pasted below from the logs).  I didn't quite understand
what it was
trying to say.  But in my code, I never used LongWritable. 
Only Text
for output key and output values, and
KeyValueTextInputFormat for
input.

What's weirder is that this exception occurs at different
places from
job to job.  Sometimes it may be thrown at the 2nd iteration
of my
loop, while other times, it may be the 3rd, the 4th etc. 
Can someone
explain to me what and why this is?  Also, what would be the
best way
to test/debug a hadoop job??  Thanks.


2008-01-16 00:37:19,941 INFO
org.apache.hadoop.mapred.ReduceTask:
task_200801160024_0011_r_000000_1 Copying
task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
2008-01-16 00:37:19,953 INFO
org.apache.hadoop.mapred.ReduceTask:
task_200801160024_0011_r_000000_1 done copying
task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
2008-01-16 00:37:19,955 INFO
org.apache.hadoop.mapred.ReduceTask:
task_200801160024_0011_r_000000_1 Copying of all map outputs
complete.
Initiating the last merge on the remaining files in
ramfs://mapoutput26453615
2008-01-16 00:37:20,088 WARN
org.apache.hadoop.mapred.ReduceTask:
task_200801160024_0011_r_000000_1 Final merge of the
inmemory files
threw an exception: java.io.IOException:
java.io.IOException: wrong
key class: class org.apache.hadoop.io.LongWritable is not
class
org.apache.hadoop.io.Text
	at
org.apache.hadoop.io.SequenceFile$Sorter$SegmentDescriptor.n
extRawKey(SequenceFile.java:2874)
	at
org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.merge(Se
quenceFile.java:2683)
	at
org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.
java:2437)
	at
org.apache.hadoop.mapred.ReduceTask$ReduceCopier.fetchOutput
s(ReduceTask.java:1153)
	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:1760)

	at
org.apache.hadoop.mapred.ReduceTask$ReduceCopier.fetchOutput
s(ReduceTask.java:1161)
	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:1760)

2008-01-16 00:37:20,090 WARN
org.apache.hadoop.mapred.TaskTracker:
Error running child
java.io.IOException: task_200801160024_0011_r_000000_1The
reduce copier failed
	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:253)

	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:1760)



-- 
--------------------------------------
Standing Bear Has Spoken
--------------------------------------

On Jan 15, 2008, at 21:53, Jim the Standing Bear wrote:

I was asking lot of questions today, so I am glad to
contribute at
least one answer. I have this problem when there was type
mismatch
for key or values. You need to set up right type at your
JobConf like  
this:

         conf.setOutputKeyClass(Text.class);
         conf.setOutputValueClass(LongWritable.class);

(using appropriate types our mapper produce)

Vadim

> I am using hadoop 0.15.1 to index some catalog that has
a tree-like
> structure, where the leaf nodes are data files.  My
main task is a
> loop that performs a breadth-first walkthrough that
parses out URLs to
> catalogs and datafiles at the next level, which is done
in a mapper.
> To determine when the loop should terminate, I use a
reduce task that
> counts the number of new catalogs found, and stops the
loop when the
> count is 0.
>
> But while I was running the jobs, I kept getting this
exception
> (pasted below from the logs).  I didn't quite
understand what it was
> trying to say.  But in my code, I never used
LongWritable.  Only Text
> for output key and output values, and
KeyValueTextInputFormat for
> input.
>
> What's weirder is that this exception occurs at
different places from
> job to job.  Sometimes it may be thrown at the 2nd
iteration of my
> loop, while other times, it may be the 3rd, the 4th
etc.  Can someone
> explain to me what and why this is?  Also, what would
be the best way
> to test/debug a hadoop job??  Thanks.
>
>
> 2008-01-16 00:37:19,941 INFO
org.apache.hadoop.mapred.ReduceTask:
> task_200801160024_0011_r_000000_1 Copying
> task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> 2008-01-16 00:37:19,953 INFO
org.apache.hadoop.mapred.ReduceTask:
> task_200801160024_0011_r_000000_1 done copying
> task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> 2008-01-16 00:37:19,955 INFO
org.apache.hadoop.mapred.ReduceTask:
> task_200801160024_0011_r_000000_1 Copying of all map
outputs complete.
> Initiating the last merge on the remaining files in
> ramfs://mapoutput26453615
> 2008-01-16 00:37:20,088 WARN
org.apache.hadoop.mapred.ReduceTask:
> task_200801160024_0011_r_000000_1 Final merge of the
inmemory files
> threw an exception: java.io.IOException:
java.io.IOException: wrong
> key class: class org.apache.hadoop.io.LongWritable is
not class
> org.apache.hadoop.io.Text
> 	at org.apache.hadoop.io.SequenceFile$Sorter 
> $SegmentDescriptor.nextRawKey(SequenceFile.java:2874)
> 	at org.apache.hadoop.io.SequenceFile$Sorter 
> $MergeQueue.merge(SequenceFile.java:2683)
> 	at
org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.
java: 
> 2437)
> 	at org.apache.hadoop.mapred.ReduceTask 
> $ReduceCopier.fetchOutputs(ReduceTask.java:1153)
> 	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> 	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java: 
> 1760)
>
> 	at org.apache.hadoop.mapred.ReduceTask 
> $ReduceCopier.fetchOutputs(ReduceTask.java:1161)
> 	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> 	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java: 
> 1760)
>
> 2008-01-16 00:37:20,090 WARN
org.apache.hadoop.mapred.TaskTracker:
> Error running child
> java.io.IOException:
task_200801160024_0011_r_000000_1The reduce  
> copier failed
> 	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:253)

> 	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java: 
> 1760)
>
>
>
> -- 
> --------------------------------------
> Standing Bear Has Spoken
> --------------------------------------

Well, I also wish it was this simple, but as I said in the
original
message, I never wanted to use LongWritable at all.  Here is
how I set
the job conf, and after that, is the reduce task.  Also, if
I got the
incorrect output key/value type, shouldn't it always fail as
soon as
the reduce task is run?  But my code behaves strangely that
sometimes
the exception didn't get thrown until a few iterations had
been
successfully passed...  Does the code reveal something that
I missed?
Thanks.

            JobConf countNewCatalogJobConf = new
JobConf(ThreddsCatalogIndexer.class);
           
countNewCatalogJobConf.setJobName("Count-New-Catalog-&q
uot; + iteration);
           
countNewCatalogJobConf.setInputPath(newCatUrlDir);
           
countNewCatalogJobConf.setInputFormat(KeyValueTextInputForma
t.class);
           
countNewCatalogJobConf.setOutputPath(newCatalogCountDir);
           
countNewCatalogJobConf.setOutputKeyClass(Text.class);
           
countNewCatalogJobConf.setOutputValueClass(Text.class);
           
countNewCatalogJobConf.setReducerClass(NewCatalogCounter.cla
ss);
            countNewCatalogJobConf.setNumReduceTasks(1);
            JobClient.runJob(countNewCatalogJobConf);




    public void reduce(WritableComparable key, Iterator
values,
OutputCollector output, Reporter reporter) throws
IOException {
        long sum = 0;
        if (key.toString().equals("NEWCAT")) {
            while (values.hasNext()) {
                sum++;
            }
        }
        Text sumText = new Text();
        String sumString = (new Long(sum)).toString();
        sumText.set(sumString);
        output.collect(key, sumText);
    }


On Jan 16, 2008 12:58 AM, Vadim Zaliva <krokodilgmail.com> wrote:
> On Jan 15, 2008, at 21:53, Jim the Standing Bear
wrote:
>
> I was asking lot of questions today, so I am glad to
contribute at
> least one answer. I have this problem when there was
type mismatch
> for key or values. You need to set up right type at
your JobConf like
> this:
>
>          conf.setOutputKeyClass(Text.class);
>          conf.setOutputValueClass(LongWritable.class);
>
> (using appropriate types our mapper produce)
>
> Vadim
>
>
> > I am using hadoop 0.15.1 to index some catalog
that has a tree-like
> > structure, where the leaf nodes are data files. 
My main task is a
> > loop that performs a breadth-first walkthrough
that parses out URLs to
> > catalogs and datafiles at the next level, which is
done in a mapper.
> > To determine when the loop should terminate, I use
a reduce task that
> > counts the number of new catalogs found, and stops
the loop when the
> > count is 0.
> >
> > But while I was running the jobs, I kept getting
this exception
> > (pasted below from the logs).  I didn't quite
understand what it was
> > trying to say.  But in my code, I never used
LongWritable.  Only Text
> > for output key and output values, and
KeyValueTextInputFormat for
> > input.
> >
> > What's weirder is that this exception occurs at
different places from
> > job to job.  Sometimes it may be thrown at the 2nd
iteration of my
> > loop, while other times, it may be the 3rd, the
4th etc.  Can someone
> > explain to me what and why this is?  Also, what
would be the best way
> > to test/debug a hadoop job??  Thanks.
> >
> >
> > 2008-01-16 00:37:19,941 INFO
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 Copying
> > task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> > 2008-01-16 00:37:19,953 INFO
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 done copying
> > task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> > 2008-01-16 00:37:19,955 INFO
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 Copying of all
map outputs complete.
> > Initiating the last merge on the remaining files
in
> > ramfs://mapoutput26453615
> > 2008-01-16 00:37:20,088 WARN
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 Final merge of
the inmemory files
> > threw an exception: java.io.IOException:
java.io.IOException: wrong
> > key class: class org.apache.hadoop.io.LongWritable
is not class
> > org.apache.hadoop.io.Text
> >       at org.apache.hadoop.io.SequenceFile$Sorter
> >
$SegmentDescriptor.nextRawKey(SequenceFile.java:2874)
> >       at org.apache.hadoop.io.SequenceFile$Sorter
> > $MergeQueue.merge(SequenceFile.java:2683)
> >       at
org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.
java:
> > 2437)
> >       at org.apache.hadoop.mapred.ReduceTask
> > $ReduceCopier.fetchOutputs(ReduceTask.java:1153)
> >       at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> >       at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > 1760)
> >
> >       at org.apache.hadoop.mapred.ReduceTask
> > $ReduceCopier.fetchOutputs(ReduceTask.java:1161)
> >       at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> >       at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > 1760)
> >
> > 2008-01-16 00:37:20,090 WARN
org.apache.hadoop.mapred.TaskTracker:
> > Error running child
> > java.io.IOException:
task_200801160024_0011_r_000000_1The reduce
> > copier failed
> >       at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:253)

> >       at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > 1760)
> >
> >
> >
> > --
> > --------------------------------------
> > Standing Bear Has Spoken
> > --------------------------------------
>
>



-- 
--------------------------------------
Standing Bear Has Spoken
--------------------------------------

On Jan 15, 2008, at 22:09, Jim the Standing Bear wrote:

Only thing I noticed (compared to my code) is missing:

   client.setConf(conf);

before client.run(conf).

In this case default input format is used which uses  
LongWriteableComparable as
a key. Not sure if this is a case, but something worth
checking.

Vadim


> Well, I also wish it was this simple, but as I said in
the original
> message, I never wanted to use LongWritable at all. 
Here is how I set
> the job conf, and after that, is the reduce task. 
Also, if I got the
> incorrect output key/value type, shouldn't it always
fail as soon as
> the reduce task is run?  But my code behaves strangely
that sometimes
> the exception didn't get thrown until a few iterations
had been
> successfully passed...  Does the code reveal something
that I missed?
> Thanks.
>
>            JobConf countNewCatalogJobConf = new
> JobConf(ThreddsCatalogIndexer.class);
>           
countNewCatalogJobConf.setJobName("Count-New-Catalog-&q
uot; +  
> iteration);
>           
countNewCatalogJobConf.setInputPath(newCatUrlDir);
>             
>
countNewCatalogJobConf.setInputFormat(KeyValueTextInputForma
t.class);
>           
countNewCatalogJobConf.setOutputPath(newCatalogCountDir);
>           
countNewCatalogJobConf.setOutputKeyClass(Text.class);
>           
countNewCatalogJobConf.setOutputValueClass(Text.class);
>             
>
countNewCatalogJobConf.setReducerClass(NewCatalogCounter.cla
ss);
>           
countNewCatalogJobConf.setNumReduceTasks(1);
>            JobClient.runJob(countNewCatalogJobConf);
>
>
>
>
>    public void reduce(WritableComparable key, Iterator
values,
> OutputCollector output, Reporter reporter) throws
IOException {
>        long sum = 0;
>        if (key.toString().equals("NEWCAT"))
{
>            while (values.hasNext()) {
>                sum++;
>            }
>        }
>        Text sumText = new Text();
>        String sumString = (new Long(sum)).toString();
>        sumText.set(sumString);
>        output.collect(key, sumText);
>    }
>
>

I encountered a similar case.
Here is the Jira: htt
ps://issues.apache.org/jira/browse/HADOOP-2164

Runping


> -----Original Message-----
> From: Vadim Zaliva [mailto:krokodilgmail.com]
> Sent: Tuesday, January 15, 2008 9:59 PM
> To: hadoop-userlucene.apache.org
> Subject: Re: unable to figure out this exception from
reduce task
> 
> On Jan 15, 2008, at 21:53, Jim the Standing Bear
wrote:
> 
> I was asking lot of questions today, so I am glad to
contribute at
> least one answer. I have this problem when there was
type mismatch
> for key or values. You need to set up right type at
your JobConf like
> this:
> 
>          conf.setOutputKeyClass(Text.class);
>          conf.setOutputValueClass(LongWritable.class);
> 
> (using appropriate types our mapper produce)
> 
> Vadim
> 
> > I am using hadoop 0.15.1 to index some catalog
that has a tree-like
> > structure, where the leaf nodes are data files. 
My main task is a
> > loop that performs a breadth-first walkthrough
that parses out URLs
to
> > catalogs and datafiles at the next level, which is
done in a mapper.
> > To determine when the loop should terminate, I use
a reduce task
that
> > counts the number of new catalogs found, and stops
the loop when the
> > count is 0.
> >
> > But while I was running the jobs, I kept getting
this exception
> > (pasted below from the logs).  I didn't quite
understand what it was
> > trying to say.  But in my code, I never used
LongWritable.  Only
Text
> > for output key and output values, and
KeyValueTextInputFormat for
> > input.
> >
> > What's weirder is that this exception occurs at
different places
from
> > job to job.  Sometimes it may be thrown at the 2nd
iteration of my
> > loop, while other times, it may be the 3rd, the
4th etc.  Can
someone
> > explain to me what and why this is?  Also, what
would be the best
way
> > to test/debug a hadoop job??  Thanks.
> >
> >
> > 2008-01-16 00:37:19,941 INFO
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 Copying
> > task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> > 2008-01-16 00:37:19,953 INFO
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 done copying
> > task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> > 2008-01-16 00:37:19,955 INFO
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 Copying of all
map outputs
complete.
> > Initiating the last merge on the remaining files
in
> > ramfs://mapoutput26453615
> > 2008-01-16 00:37:20,088 WARN
org.apache.hadoop.mapred.ReduceTask:
> > task_200801160024_0011_r_000000_1 Final merge of
the inmemory files
> > threw an exception: java.io.IOException:
java.io.IOException: wrong
> > key class: class org.apache.hadoop.io.LongWritable
is not class
> > org.apache.hadoop.io.Text
> > 	at org.apache.hadoop.io.SequenceFile$Sorter
> >
$SegmentDescriptor.nextRawKey(SequenceFile.java:2874)
> > 	at org.apache.hadoop.io.SequenceFile$Sorter
> > $MergeQueue.merge(SequenceFile.java:2683)
> > 	at
org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.
java:
> > 2437)
> > 	at org.apache.hadoop.mapred.ReduceTask
> > $ReduceCopier.fetchOutputs(ReduceTask.java:1153)
> > 	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> > 	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > 1760)
> >
> > 	at org.apache.hadoop.mapred.ReduceTask
> > $ReduceCopier.fetchOutputs(ReduceTask.java:1161)
> > 	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> > 	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > 1760)
> >
> > 2008-01-16 00:37:20,090 WARN
org.apache.hadoop.mapred.TaskTracker:
> > Error running child
> > java.io.IOException:
task_200801160024_0011_r_000000_1The reduce
> > copier failed
> > 	at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:253)

> > 	at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > 1760)
> >
> >
> >
> > --
> > --------------------------------------
> > Standing Bear Has Spoken
> > --------------------------------------

Thanks Runping.  It seems the bug is still open.  However,
in my case,
there were more than plenty of disk space available.



On Jan 16, 2008 2:44 AM, Runping Qi <runpingyahoo-inc.com> wrote:
>
> I encountered a similar case.
> Here is the Jira: htt
ps://issues.apache.org/jira/browse/HADOOP-2164
>
> Runping
>
>
>
> > -----Original Message-----
> > From: Vadim Zaliva [mailto:krokodilgmail.com]
> > Sent: Tuesday, January 15, 2008 9:59 PM
> > To: hadoop-userlucene.apache.org
> > Subject: Re: unable to figure out this exception
from reduce task
> >
> > On Jan 15, 2008, at 21:53, Jim the Standing Bear
wrote:
> >
> > I was asking lot of questions today, so I am glad
to contribute at
> > least one answer. I have this problem when there
was type mismatch
> > for key or values. You need to set up right type
at your JobConf like
> > this:
> >
> >          conf.setOutputKeyClass(Text.class);
> >         
conf.setOutputValueClass(LongWritable.class);
> >
> > (using appropriate types our mapper produce)
> >
> > Vadim
> >
> > > I am using hadoop 0.15.1 to index some
catalog that has a tree-like
> > > structure, where the leaf nodes are data
files.  My main task is a
> > > loop that performs a breadth-first
walkthrough that parses out URLs
> to
> > > catalogs and datafiles at the next level,
which is done in a mapper.
> > > To determine when the loop should terminate,
I use a reduce task
> that
> > > counts the number of new catalogs found, and
stops the loop when the
> > > count is 0.
> > >
> > > But while I was running the jobs, I kept
getting this exception
> > > (pasted below from the logs).  I didn't quite
understand what it was
> > > trying to say.  But in my code, I never used
LongWritable.  Only
> Text
> > > for output key and output values, and
KeyValueTextInputFormat for
> > > input.
> > >
> > > What's weirder is that this exception occurs
at different places
> from
> > > job to job.  Sometimes it may be thrown at
the 2nd iteration of my
> > > loop, while other times, it may be the 3rd,
the 4th etc.  Can
> someone
> > > explain to me what and why this is?  Also,
what would be the best
> way
> > > to test/debug a hadoop job??  Thanks.
> > >
> > >
> > > 2008-01-16 00:37:19,941 INFO
org.apache.hadoop.mapred.ReduceTask:
> > > task_200801160024_0011_r_000000_1 Copying
> > > task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> > > 2008-01-16 00:37:19,953 INFO
org.apache.hadoop.mapred.ReduceTask:
> > > task_200801160024_0011_r_000000_1 done
copying
> > > task_200801160024_0011_m_000000_0 output from
ginkgo.mycluster.org
> > > 2008-01-16 00:37:19,955 INFO
org.apache.hadoop.mapred.ReduceTask:
> > > task_200801160024_0011_r_000000_1 Copying of
all map outputs
> complete.
> > > Initiating the last merge on the remaining
files in
> > > ramfs://mapoutput26453615
> > > 2008-01-16 00:37:20,088 WARN
org.apache.hadoop.mapred.ReduceTask:
> > > task_200801160024_0011_r_000000_1 Final merge
of the inmemory files
> > > threw an exception: java.io.IOException:
java.io.IOException: wrong
> > > key class: class
org.apache.hadoop.io.LongWritable is not class
> > > org.apache.hadoop.io.Text
> > >     at
org.apache.hadoop.io.SequenceFile$Sorter
> > >
$SegmentDescriptor.nextRawKey(SequenceFile.java:2874)
> > >     at
org.apache.hadoop.io.SequenceFile$Sorter
> > > $MergeQueue.merge(SequenceFile.java:2683)
> > >     at
>
org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.
java:
> > > 2437)
> > >     at org.apache.hadoop.mapred.ReduceTask
> > >
$ReduceCopier.fetchOutputs(ReduceTask.java:1153)
> > >     at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> > >     at
>
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > > 1760)
> > >
> > >     at org.apache.hadoop.mapred.ReduceTask
> > >
$ReduceCopier.fetchOutputs(ReduceTask.java:1161)
> > >     at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:252)

> > >     at
>
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > > 1760)
> > >
> > > 2008-01-16 00:37:20,090 WARN
org.apache.hadoop.mapred.TaskTracker:
> > > Error running child
> > > java.io.IOException:
task_200801160024_0011_r_000000_1The reduce
> > > copier failed
> > >     at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:253)

> > >     at
>
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.
java:
> > > 1760)
> > >
> > >
> > >
> > > --
> > > --------------------------------------
> > > Standing Bear Has Spoken
> > > --------------------------------------
>
>



-- 
--------------------------------------
Standing Bear Has Spoken
--------------------------------------