Consolidate MRv2 maven modules
------------------------------
Key: MAPREDUCE-3367
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3367
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: build, mrv2
Affects Versions: 0.23.0
Environment: Java, Maven
Reporter: Eric Yang
Assignee: Eric Yang
Maven modules for MRv2 has been splitter into many small pieces, like this:
{noformat}
[INFO] hadoop-yarn ....................................... SUCCESS [0.312s]
[INFO] hadoop-yarn-api ................................... SUCCESS [24.184s]
[INFO] hadoop-yarn-common ................................ SUCCESS [18.243s]
[INFO] hadoop-yarn-server ................................ SUCCESS [0.094s]
[INFO] hadoop-yarn-server-common ......................... SUCCESS [5.394s]
[INFO] hadoop-yarn-server-nodemanager .................... SUCCESS [7.056s]
[INFO] hadoop-yarn-server-web-proxy ...................... SUCCESS [2.295s]
[INFO] hadoop-yarn-server-resourcemanager ................ SUCCESS [10.217s]
[INFO] hadoop-yarn-server-tests .......................... SUCCESS [0.395s]
[INFO] hadoop-yarn-applications .......................... SUCCESS [0.069s]
[INFO] hadoop-yarn-applications-distributedshell ......... SUCCESS [2.534s]
[INFO] hadoop-yarn-site .................................. SUCCESS [0.144s]
[INFO] hadoop-mapreduce-client ........................... SUCCESS [0.073s]
[INFO] hadoop-mapreduce-client-core ...................... SUCCESS [13.727s]
[INFO] hadoop-mapreduce-client-common .................... SUCCESS [13.045s]
[INFO] hadoop-mapreduce-client-shuffle ................... SUCCESS [1.909s]
[INFO] hadoop-mapreduce-client-app ....................... SUCCESS [6.676s]
[INFO] hadoop-mapreduce-client-hs ........................ SUCCESS [3.317s]
[INFO] hadoop-mapreduce-client-jobclient ................. SUCCESS [2.575s]
[INFO] hadoop-mapreduce .................................. SUCCESS [4.952s]
{noformat}
The excessive use of directory structure is slowing down development and
compile time. For example, hadoop-yarn-server-tests and hadoop-yarn-site
should not be stand alone modules. There are better ways to organize the
source code. The proposal is to rearrange the code to:
{noformat}
Apache Hadoop Mapreduce Project
- Apache Hadoop Mapreduce Client
- Apache Hadoop YARN
{noformat}
This is a nice to have for 0.23, but optional.
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