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From Bo Sang <sampl...@gmail.com>
Subject About "fetch fails" during reduce phrase
Date Tue, 01 Mar 2011 18:42:57 GMT
Hi, guys:

During reduce phrase, hadoop always report a lot of the following error
information:

11/03/01 13:36:04 INFO mapreduce.Job: Task Id :
attempt_201102281006_0004_m_000002_1, Status : FAILED
Too many fetch-failures
11/03/01 13:36:04 WARN mapreduce.Job: Error reading task
outputhttp://localhost.localdomain:50060/tasklog?plaintext=true&attemptid=attempt_201102281006_0004_m_000002_1&filter=stdout
11/03/01 13:36:04 WARN mapreduce.Job: Error reading task
outputhttp://localhost.localdomain:50060/tasklog?plaintext=true&attemptid=attempt_201102281006_0004_m_000002_1&filter=stderr
11/03/01 13:36:09 INFO mapreduce.Job:  map 93% reduce 16%
11/03/01 13:36:12 INFO mapreduce.Job:  map 100% reduce 16%
11/03/01 13:36:26 INFO mapreduce.Job: Task Id :
attempt_201102281006_0004_m_000009_0, Status : FAILED
Too many fetch-failures
11/03/01 13:36:26 WARN mapreduce.Job: Error reading task
outputhttp://localhost.localdomain:50060/tasklog?plaintext=true&attemptid=attempt_201102281006_0004_m_000009_0&filter=stdout
11/03/01 13:36:26 WARN mapreduce.Job: Error reading task
outputhttp://localhost.localdomain:50060/tasklog?plaintext=true&attemptid=attempt_201102281006_0004_m_000009_0&filter=stderr

Though finally I could get the right results, I wonder what's the causes of
so many these error reports. Do you have similar experience? Or do you have
any suggestions about my problem?

Thanks!

-- 
Best Regards!

Sincerely
Bo Sang

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