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https://issues.apache.org/jira/browse/HADOOP-17299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17208142#comment-17208142
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Steve Loughran commented on HADOOP-17299:
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make sense
> DistCp should fail fast if the configuration is not valid
> ---------------------------------------------------------
>
> Key: HADOOP-17299
> URL: https://issues.apache.org/jira/browse/HADOOP-17299
> Project: Hadoop Common
> Issue Type: Bug
> Components: tools/distcp
> Reporter: Akira Ajisaka
> Priority: Major
>
> If the number of Map task is more than 200 and using dynamic option, DistCp
> always fails by DynamicInputFormat#validateNumChunksUsing. This failure is
> after building the src/dst paths, which takes more than 10 minutes if the
> directory is large (i.e. DistCp fails by configuration error after more than
> 10 minutes).
> I think DistCp should validate the configuration before building the src/dst
> paths and fail if the configuration is not valid.
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