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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2916) Refactor src structure, but leave package structure along
Date Tue, 11 Mar 2008 21:22:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577605#action_12577605
] 

Sanjay Radia commented on HADOOP-2916:
--------------------------------------

>Why make this change independent of HADOOP-2885? In either case, HADOOP-2885 will not
be implementable as a patch file, but will require direct svn >operations to rename files.
Both issues will break other existing patch files. So why not combine them?

2885 will require that we block other patches from being submitted commits while 2885 is being
completed.
Hence, we would like to finish 2885 in under 2 days.
The idea was break down HADOOP-2885 into smaller parts; this jira (2916) was an attempt todo
that.
Note that this jira has the property that it has no binary changes; in contrast 2885 changes
binary due to package renames.

After this jira is completed,  HADOOP-2885
-  will not require any renames in src/mapred or src/core;
-  will change only imports in src/mapred and src/core 
-- Patches on src/mapred and src/core will mostly be auto merged
-  will require renames within src/hdfs due to the change in package structure within hdfs.

-- Doug is  right in that 2885 will require renames within src/hdfs  and hence we are duplicating
those renames. 

After this jira, javadoc cleanup of core/mapred can start independent of 2885 (required for
0.17).
Similarly, work on separate jars can also start if desired (not required for 0.17)

Furthermore, there is a small possibility that  2885 might not make in 0.17 while this jira
is likely to be completed in 0.17.



> Refactor src structure, but leave package structure along
> ---------------------------------------------------------
>
>                 Key: HADOOP-2916
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2916
>             Project: Hadoop Core
>          Issue Type: Sub-task
>          Components: dfs
>            Reporter: Sanjay Radia
>            Assignee: Raghu Angadi
>             Fix For: 0.17.0
>
>
> This Jira proposes that the src structure be split  as below.
>  The package structure remains the same for this Jira. (Package renaming is part of other
JIras  such as HADOOP-2885).
> The idea is that the src will be split   BEFORE the package restructuring
> The new proposed src structure is
> src/test - unchanged
> src/java - will no longer exit , its content will be move to one of core, hdfs, or mapred
> src/core - this will contain the core classes that hadoop applications need to link against.
>   It will contain client side libraries of  all fs file systems:  local, hdfs, kfs, etc
>   jar name hadoop_core.jar
>    src/core/org.apache.hadoop.{conf, fs, filechache, io, ipc, log, metrics, net, record,
security, tools, util)
>    src/core/org.apache.hadoop.dfs - this will contain only the client side parts of dfs.
>                    HADOOP-2885 will rename package dfs  to package  fs.hdfs 
> src/hdfs/org.apache.hadoop.dfs - this will contain only the server side of hdfs. 
>       HADOOP-2885 will rename package dfs  to package  fs.hdfs later; a compatible dfs.DistributedFileSystem
will be left for compatibility/
>    jar name hadoop_hdfs.jar - this jar can be used to launce NNs and DNs etc.
> src/mapred/org.apache.hadoop.mapred.*
>    Initially one jar:  hadoop_mapred.jar
>    Later this may be split into client-side and server-side jars.

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