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MapReduce, mail # user - Hadoop in Pseudo-Distributed


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RE: Hadoop in Pseudo-Distributed
Devaraj k 2012-08-13, 05:41
Can you go through this issue https://issues.apache.org/jira/browse/HADOOP-7489, It is discussed and provided some workarounds for this problem.

Thanks

Devaraj

________________________________
From: Subho Banerjee [[EMAIL PROTECTED]]
Sent: Monday, August 13, 2012 10:47 AM
To: [EMAIL PROTECTED]
Subject: Hadoop in Pseudo-Distributed
Hello,

I am running hadoop v1.0.3 in Mac OS X 10.8 with Java_1.6.0_33-b03-424
When running hadoop on pseudo-distributed mode, the map seems to work, but it cannot compute the reduce.

12/08/13 08:58:12 INFO mapred.JobClient: Running job: job_201208130857_0001
12/08/13 08:58:13 INFO mapred.JobClient: map 0% reduce 0%
12/08/13 08:58:27 INFO mapred.JobClient: map 20% reduce 0%
12/08/13 08:58:33 INFO mapred.JobClient: map 30% reduce 0%
12/08/13 08:58:36 INFO mapred.JobClient: map 40% reduce 0%
12/08/13 08:58:39 INFO mapred.JobClient: map 50% reduce 0%
12/08/13 08:58:42 INFO mapred.JobClient: map 60% reduce 0%
12/08/13 08:58:45 INFO mapred.JobClient: map 70% reduce 0%
12/08/13 08:58:48 INFO mapred.JobClient: map 80% reduce 0%
12/08/13 08:58:51 INFO mapred.JobClient: map 90% reduce 0%
12/08/13 08:58:54 INFO mapred.JobClient: map 100% reduce 0%
12/08/13 08:59:14 INFO mapred.JobClient: Task Id : attempt_201208130857_0001_m_000000_0, Status : FAILED
Too many fetch-failures
12/08/13 08:59:14 WARN mapred.JobClient: Error reading task outputServer returned HTTP response code: 403 for URL: http://10.1.66.17:50060/tasklog?plaintext=true&attemptid=attempt_201208130857_0001_m_000000_0&filter=stdout
12/08/13 08:59:14 WARN mapred.JobClient: Error reading task outputServer returned HTTP response code: 403 for URL: http://10.1.66.17:50060/tasklog?plaintext=true&attemptid=attempt_201208130857_0001_m_000000_0&filter=stderr
12/08/13 08:59:18 INFO mapred.JobClient: map 89% reduce 0%
12/08/13 08:59:21 INFO mapred.JobClient: map 100% reduce 0%
12/08/13 09:00:14 INFO mapred.JobClient: Task Id : attempt_201208130857_0001_m_000001_0, Status : FAILED
Too many fetch-failures

Here is what I get when I try to see the tasklog using the links given in the output

http://10.1.66.17:50060/tasklog?plaintext=true&attemptid=attempt_201208130857_0001_m_000000_0&filter=stderr --->
2012-08-13 08:58:39.189 java[74092:1203] Unable to load realm info from SCDynamicStore

http://10.1.66.17:50060/tasklog?plaintext=true&attemptid=attempt_201208130857_0001_m_000000_0&filter=stdout --->

I have changed my hadoop-env.sh acoording to Mathew Buckett in https://issues.apache.org/jira/browse/HADOOP-7489

Also this error of Unable to load realm info from SCDynamicStore does not show up when I do 'hadoop namenode -format' or 'start-all.sh'

I am also attaching a zipped copy of my logs
Cheers,

Subho.