[jira] Commented: (HADOOP-3750) Fix and enforce module dependencies

["Tom White (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612848#action_12612848 ] 

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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