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https://issues.apache.org/jira/browse/HADOOP-5015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705359#action_12705359
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dhruba borthakur commented on HADOOP-5015:
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This patch is not related to HADOOP-3799. This patch attempts to separate out
the block manager code from the namespace manager code whereas HADOOP-3799
makes the replica-placement pluggable.
> 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
>
>
> 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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