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https://issues.apache.org/jira/browse/HADOOP-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613429#action_12613429
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Doug Cutting commented on HADOOP-3750:
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> mapred depends on core and hdfs

No, mapred should only depend on core.  Core should include the FileSystem API, 
which should be sufficient for mapreduce.

> Fix and enforce module dependencies
> -----------------------------------
>
>                 Key: HADOOP-3750
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3750
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Tom White
>
> Since HADOOP-2916 Hadoop Core consists of modules in independent source 
> trees: core, hdfs, mapred (and others). The dependencies between them should 
> be enforced to avoid cyclic dependencies. At present they all have 
> dependencies on each other.

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