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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2239) Reduce access levels of the fields and methods in FSNamesystem
Date Tue, 09 Aug 2011 17:09:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081769#comment-13081769

Suresh Srinivas commented on HDFS-2239:

# In order to keep the code simpler, please consider adding FSNamesystem#getDatanodeManager()
instead of cluster.getNamesystem().getBlockManager().getDatanodeManager(). 
# Even for upgrade manager now we have {{namesystem.getUpgradeManager().processUpgradeCommand(comm)}}.
I feel this kind of code exposes the internal structure and interfaces of internal components,
making future code changes hard. See http://en.wikipedia.org/wiki/Law_of_Demeter

> Reduce access levels of the fields and methods in FSNamesystem
> --------------------------------------------------------------
>                 Key: HDFS-2239
>                 URL: https://issues.apache.org/jira/browse/HDFS-2239
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h2239_20110808.patch, h2239_20110808b.patch

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