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https://issues.apache.org/jira/browse/HADOOP-5015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas updated HADOOP-5015:
------------------------------------

    Attachment: blkmanager.patch

Incorporated all the comments in the attached patch, except the following:
# Not moving {{generationStamp}} to blockManager as it is used in 
{{FSNamesystem}} and updated during file creation
# {{blockInvalidateLimit}} can be renamed in a separate change
# {{replicationRecheckInterval}} should be moved into {{ReplicationMonitor}} in 
a separate change


> Separate block/replica management code from FSNamesystem
> --------------------------------------------------------
>
>                 Key: HADOOP-5015
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5015
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Suresh Srinivas
>             Fix For: 0.21.0
>
>         Attachments: blkmanager.patch, blkmanager.patch
>
>
> Currently FSNamesystem contains a big amount of code that manages blocks and 
> replicas. The code scatters in FSNamesystem and it is hard to read and 
> maintain. It would be nice to move the code to a separate class called, for 
> example, BlockManager. 

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