FAQ
Hi users,

I got this "Too many fetch failures" in the following error message:

*09/07/20 23:33:39 INFO mapred.JobClient: map 100% reduce 16%
09/07/20 23:46:22 INFO mapred.JobClient: Task Id :
attempt_200907202331_0001_m_000001_0, Status : FAILED
Too many fetch-failures
09/07/20 23:46:37 INFO mapred.JobClient: Job complete: job_200907202331_0001

*Don't know why it always stops at reduce 16% then assumes. It take a long
time even to run a small task.

I saw people asking the same question in previous mail list, but I don't get
the help I need.

Hadoop version: 0.18.3
Ubuntu version: 8.04

Thank you in advance!

George

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  • Jothi Padmanabhan at Jul 21, 2009 at 7:35 am
    This error occurs when several reducers are unable to fetch the given map
    output ( attempt_200907202331_0001_m_000001_0 in your example).
    I am guessing that there is a configuration issue in your setup -- the
    reducers are not able to contact/transfer map outputs from the TaskTracker.
    The TT log on the node where the map ran could throw some light on the
    error. Could you verify if all the nodes in your cluster are able to connect
    with others? You could also manually login to the reducer node and try
    pulling the map output yourself and see what error you are getting.

    Cheers
    Jothi
    On 7/21/09 12:33 PM, "George Pang" wrote:

    Hi users,

    I got this "Too many fetch failures" in the following error message:

    *09/07/20 23:33:39 INFO mapred.JobClient: map 100% reduce 16%
    09/07/20 23:46:22 INFO mapred.JobClient: Task Id :
    attempt_200907202331_0001_m_000001_0, Status : FAILED
    Too many fetch-failures
    09/07/20 23:46:37 INFO mapred.JobClient: Job complete: job_200907202331_0001

    *Don't know why it always stops at reduce 16% then assumes. It take a long
    time even to run a small task.

    I saw people asking the same question in previous mail list, but I don't get
    the help I need.

    Hadoop version: 0.18.3
    Ubuntu version: 8.04

    Thank you in advance!

    George

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postedJul 21, '09 at 7:02a
activeJul 21, '09 at 7:35a
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