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General instructions on how to deploy the poms and jars to Maven Central can be found at the Apache page on publishing maven artifacts.

Flume-specific instructions:

After you get your settings.xml file configured correctly (see above link) then you can run: mvn clean deploy -DskipTests -Papache-release to push the artifacts to the staging repo.
You will need to go to the Apache Maven Repository @ http://repository.apache.org/ and log in with your Apache LDAP credentials
Once you log in you will see Build Promotion > Staging Repositories on the left hand side
You will want to edit the Flume artifacts that you don't want to push to Maven (you can delete stuff like the release tarball)
Click Close to make the artifatcs available on the Staging repository.
To push to Central, you click Release.

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