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https://issues.apache.org/jira/browse/HADOOP-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612848#action_12612848
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Tom White commented on HADOOP-3750:
-----------------------------------
The simplest way to enforce this would be to compile core, hdfs and mapred
independently (hdfs depends on core, mapred depends on core and hdfs).
Bill de hÓra has [mapped the dependency
cycles|http://www.dehora.net/journal/2008/07/06/3-12-minutes-to-sort-a-terabyte-hadoops-code-structure/]
in the codebase using
[Structure101|http://www.headwaysoftware.com/products/structure101/index.php].
We should consider using this for keeping an eye on further dependency problems.
> 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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