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From "Alejandro Abdelnur (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8009) Create hadoop-client and hadoop-test artifacts for downstream projects
Date Tue, 31 Jan 2012 17:39:10 GMT
Create hadoop-client and hadoop-test artifacts for downstream projects 

                 Key: HADOOP-8009
                 URL: https://issues.apache.org/jira/browse/HADOOP-8009
             Project: Hadoop Common
          Issue Type: Improvement
          Components: build
    Affects Versions: 1.0.0, 0.23.0, 0.22.0, 0.24.0, 0.23.1
            Reporter: Alejandro Abdelnur
            Assignee: Alejandro Abdelnur
            Priority: Critical

Using Hadoop from projects like Pig/Hive/Sqoop/Flume/Oozie or any in-house system that interacts
with Hadoop is quite challenging for the following reasons:

* *Different versions of Hadoop produce different artifacts:* Before Hadoop 0.23 there was
a single artifact hadoop-core, starting with Hadoop 0.23 there are several (common, hdfs,
mapred*, yarn*)

* *There are no 'client' artifacts:* Current artifacts include all JARs needed to run the
services, thus bringing into clients several JARs that are not used for job submission/monitoring
(servlet, jsp, tomcat, jersey, etc.)

* *Doing testing on the client side is also quite challenging as more artifacts have to be
included than the dependencies define:* for example, the history-server artifact has to be
explicitly included. If using Hadoop 1 artifacts, jersey-server has to be explicitly included.

* *3rd party dependencies change in Hadoop from version to version:* This makes things complicated
for projects that have to deal with multiple versions of Hadoop as their exclusions list become
a huge mix & match of artifacts from different Hadoop versions and it may be break things
when a particular version of Hadoop requires a dependency that other version of Hadoop does
not require.

Because of this it would be quite convenient to have the following 'aggregator' artifacts:

* *org.apache.hadoop:hadoop-client* : it includes all required JARs to use Hadoop client APIs
(excluding all JARs that are not needed for it)
* *org.apache.hadoop:hadoop-test* : it includes all required JARs to run Hadoop Mini Clusters

These aggregator artifacts would be created for current branches under development (trunk,
0.22, 0.23, 1.0) and for released versions that are still in use.

For branches under development, these artifacts would be generated as part of the build.

For released versions we would have a a special branch used only as vehicle for publishing
the corresponding 'aggregator' artifacts.

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