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HDFS, mail # user - Re: Error using hadoop in non-distributed mode


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Pat Ferrel 2012-09-04, 17:03
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Re: Error using hadoop in non-distributed mode
Hemanth Yamijala 2012-09-05, 04:22
Hi,

The path /tmp/hadoop-pat/mapred/local/archive/-4686065962599733460_1587570556_150738331/<snip>
is a location used by the tasktracker process for the 'DistributedCache' -
a mechanism to distribute files to all tasks running in a map reduce job. (
http://hadoop.apache.org/common/docs/r1.0.3/mapred_tutorial.html#DistributedCache
).

You have mentioned Mahout, so I am assuming that the specific analysis job
you are running is using this feature to distribute the output of the file /
Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000 to the job that is
causing a failure.

Also, I find links stating the distributed cache does not work with in the
local (non-HDFS) mode. (
http://stackoverflow.com/questions/9148724/multiple-input-into-a-mapper-in-hadoop).
Look at the second answer.

Thanks
hemanth
On Tue, Sep 4, 2012 at 10:33 PM, Pat Ferrel <[EMAIL PROTECTED]> wrote:

> The job is creating several output and intermediate files all under the
> location: Users/pat/Projects/big-data/b/ssvd/ several output directories
> and files are created correctly and the
> file Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000 is created and
> exists at the time of the error. We seem to be passing
> in Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000 as the input file.
>
> Under what circumstances would an input path passed in as
> "Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000" be turned into
> "pat/mapred/local/archive/6590995089539988730_1587570556_37122331/file/Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000"
>
> ???
>
>
> On Sep 4, 2012, at 1:14 AM, Narasingu Ramesh <[EMAIL PROTECTED]>
> wrote:
>
> Hi Pat,
>             Please specify correct input file location.
> Thanks & Regards,
> Ramesh.Narasingu
>
> On Mon, Sep 3, 2012 at 9:28 PM, Pat Ferrel <[EMAIL PROTECTED]> wrote:
>
>> Using hadoop with mahout in a local filesystem/non-hdfs config for
>> debugging purposes inside Intellij IDEA. When I run one particular part of
>> the analysis I get the error below. I didn't write the code but we are
>> looking for some hint about what might cause it. This job completes without
>> error in a single node pseudo-clustered config outside of IDEA.
>>
>> several jobs in the pipeline complete without error creating part files
>> just fine in the local file system
>>
>> The file
>> /tmp/hadoop-pat/mapred/local/archive/6590995089539988730_1587570556_37122331/file/Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000
>>
>> which is the subject of the error - does not exist
>>
>> Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000
>>
>> does exist at the time of the error. So the code is looking for the data
>> in the wrong place?
>>
>> ….
>> 12/09/02 14:56:29 INFO compress.CodecPool: Got brand-new decompressor
>> 12/09/02 14:56:29 INFO compress.CodecPool: Got brand-new decompressor
>> 12/09/02 14:56:29 INFO compress.CodecPool: Got brand-new decompressor
>> 12/09/02 14:56:29 WARN mapred.LocalJobRunner: job_local_0002
>> java.io.FileNotFoundException: File
>> /tmp/hadoop-pat/mapred/local/archive/-4686065962599733460_1587570556_150738331/file/Users/pat/Projects/big-data/b/ssvd/Q-job/R-m-00000
>> does not exist.
>>         at
>> org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:371)
>>         at
>> org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:245)
>>         at
>> org.apache.mahout.common.iterator.sequencefile.SequenceFileDirValueIterator.<init>(SequenceFileDirValueIterator.java:92)
>>         at
>> org.apache.mahout.math.hadoop.stochasticsvd.BtJob$BtMapper.setup(BtJob.java:219)
>>         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
>>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
>>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
>>         at
>> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)
>> Exception in thread "main" java.io.IOException: Bt job unsuccessful.
>>         at
>> org.apache.mahout.math.hadoop.stochasticsvd.BtJob.run(BtJob.java:609)
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Pat Ferrel 2012-09-03, 15:58