[HADOOP-3305] Publish hadoop-core to the apache repository with an appropriate POM file

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.16.2, 0.16.3
• Component/s: build

Release Note

This build.xml pulls the ivy.jar by itself and doesn't require any environment change except for ant-1.7.0. Builds can go as we do now expect that the machine which runs the build has to be online for resolving the dependencies as it resolves dependencies from maven repository.

Minimum ant version requirement - 1.7.0

• Assignee: Giridharan Kesavan
• Reporter: Steve Loughran
• Created: 24/Apr/08 12:26
• Updated: 02/May/13 02:29
• Resolved: 15/Dec/08 23:15

Description

To let people downstream build/test with hadoop, using Apache Ivy or Apache Maven2 to pull it down, hadoop-core needs to be published to the apache repository with a .pom file that lists its mandatory dependencies.

In an automated build process, this means
-having a template XML pom defining all included dependencies (and excluded transient dependency artifacts)
-having a property file driving version numbering of all artifacts
-copying this template with property expansion to create the release POM file
-public releases only: sticking this POM file up on people.apache.org in the right place, along with the JAR and some .md5 checksums

There's a risk that if the hadoop team dont do this, someone else will (as mahout are doing under http://people.apache.org/~kalle/mahout/maven2/org/apache/hadoop/ )
This is bad as hadoop end up fielding the support calls from someone elses files.

Before automating the process, existing hadoop-core JARs can be pushed out with hand-encoded POM files. The repository police dont allow pom files ever to be changed, so supporting existing releases (.16.2, 0.16.3 ... ) is a way of beta testing the POMs.

Issue Links

• is blocked by: HADOOP-3676 Remove Hadoop's dependance on the cli 2 snapshot
• is depended upon by: HADOOP-3302 Support Maven-based builds
• is duplicated by: HADOOP-6331 Upload Hadoop core jars to a public maven repository
• is duplicated by: HADOOP-3817 Maven build from hadoop-core