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https://issues.apache.org/jira/browse/HADOOP-2885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575989#action_12575989
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Sanjay Radia commented on HADOOP-2885:
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FSConstants will need to be refactored as part of this restructure.
Those that are
- for server side (NN, DN, Balancer etc)
- many of the individual constants can move to the appropriate
classes but there are probably some that are common across NN, DN
- for client side classes (DistributedFileSystem and DFSClient)
- opcodes for the client rpc, time outs etc
- for applications - these should be moved to hadoop.fs or to config
defaults.
- default block size, max path name etc
- are these properties of hadoop.fs or hdfs?
There are probably applications that use come of these constants and hence we
will need to deprecate FSConstants
> Restructure the hadoop.dfs package
> ----------------------------------
>
> Key: HADOOP-2885
> URL: https://issues.apache.org/jira/browse/HADOOP-2885
> Project: Hadoop Core
> Issue Type: Sub-task
> Components: dfs
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Priority: Minor
> Fix For: 0.17.0
>
> Attachments: Prototype dfs package.png
>
>
> This Jira proposes restructurign the package hadoop.dfs.
> 1. Move all server side and internal protocols (NN-DD etc) to
> hadoop.dfs.server.*
> 2. Further breakdown of dfs.server.
> - dfs.server.namenode.*
> - dfs.server.datanode.*
> - dfs.server.balancer.*
> - dfs.server.common.* - stuff shared between the various servers
> - dfs.protocol.* - internal protocol between DN, NN and Balancer etc.
> 3. Client interface:
> - hadoop.dfs.DistributedFileSystem.java
> - hadoop.dfs.ChecksumDistributedFileSystem.java
> - hadoop.dfs.HftpFilesystem.java
> - hadoop.dfs.protocol.* - the client side protocol
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