[jira] [Created] (HDDS-1115) Provide ozone specific top-level pom.xml

["Elek, Marton (JIRA)" <ji...@apache.org>]

Elek, Marton created HDDS-1115:
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             Summary: Provide ozone specific top-level pom.xml
                 Key: HDDS-1115
                 URL: https://issues.apache.org/jira/browse/HDDS-1115
             Project: Hadoop Distributed Data Store
          Issue Type: Improvement
          Components: build
            Reporter: Elek, Marton
            Assignee: Elek, Marton


Ozone build process doesn't require the pom.xml in the top level hadoop directory as we use hadoop 3.2 artifacts as parents of hadoop-ozone and hadoop-hdds. The ./pom.xml is used only to include the hadoop-ozone/hadoop-hdds projects in the maven reactor.

From command line, it's easy to build only the ozone artifacts:

{code}
mvn clean install -Phdds  -am -pl :hadoop-ozone-dist  -Danimal.sniffer.skip=true  -Denforcer.skip=true
{code}

Where: '-pl' defines the build of the hadoop-ozone-dist project
and '-am' defines to build all of the dependencies from the source tree (hadoop-ozone-common, hadoop-hdds-common, etc.)

But this filtering is available only from the command line.

With providing a lightweight pom.ozone.xml we can achieve the same:

 * We can open only hdds/ozone projects in the IDE/intellij. It makes the development faster as IDE doesn't need to reindex all the sources all the time + it's easy to execute checkstyle/findbugs plugins of the intellij to the whole project.
 * Longer term we should create an ozone specific source artifact (currently the source artifact for hadoop and ozone releases are the same) which also requires a simplified pom.

In this patch I also added the .mvn directory to the .gitignore file.

With 
{code}
mkdir -p .mvn && echo "-f ozone.pom.xml" > .mvn/maven.config" you can persist the usage of the ozone.pom.xml for all the subsequent builds (in the same dir)

How to test?

Just do a 'mvn -f ozonze.pom.xml clean install -DskipTests'



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