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https://issues.apache.org/jira/browse/HADOOP-1144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12492697
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Christian Kunz commented on HADOOP-1144:
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+1 for mapred.task.failures.percent (obviously).
I just added HADOOP-1304 asking for configurable number of retries for mappers
and reducers. In this context, it would be even better if
mapred.task.failures.percent could be made configurable separately for mappers
and reducers (in our environment there is usually some tolerance for mapper
failures, but zero tolerance for reducer failures).
> Hadoop should allow a configurable percentage of failed map tasks before
> declaring a job failed.
> ------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1144
> URL: https://issues.apache.org/jira/browse/HADOOP-1144
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.12.0
> Reporter: Christian Kunz
> Assigned To: Arun C Murthy
> Fix For: 0.13.0
>
>
> In our environment it can occur that some map tasks will fail repeatedly
> because of corrupt input data, which sometimes is non-critical as long as the
> amount is limited. In this case it is annoying that the whole Hadoop job
> fails and cannot be restarted till the corrupt data are identified and
> eliminated from the input. It would be extremely helpful if the job
> configuration would allow to indicate how many map tasks are allowed to fail.
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