This documents the Apache Gora release procedure. It is a dynamic document and it is
up to successive release managers to maintain it. If there is something missing, inaccurate
or just terribly worded please update the change (smile) Good luck.

What you need

  • Apache Maven is a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation from a central piece of information. In this context we use it for the entire Gora release process.
  • Gradle is a software build system similar to Apache Maven. It follows same Convention-over-Configuration principle and same project layout. In Apache Gora, we provides a Gradle plugin which simplify processing of Avro schema files. This plugin will scan for *.avsc files and generate corresponding Java persistent objects. We will use Gradle to build Gora Gradle plugin as part of release process. NB: For now, plugin release process is separate from main release process.

Hold on to your hats... Here we go!!!

Before we go any further, there is some good (potentially essential and
a huge time saving practice) documentation on this topic. Please see the below
links before going any further.


  • Create a new release in JIRA. If you do not already have these privileges
    ask your PMC Chair.
  • Push off all open issues to the next release; any critical or blocker
    issues should be resolved on mailing list. Discuss any issues that you
    are unsure of on the mailing list.

Preparing a release candidate (RC) for community VOTE'ing

As mentioned above, in Gora we use Maven as a release management tool.
We therefore rely predominantly on the maven-release-plugin for the release
lifecycle. This includes preparing and RC for a community VOTE.

  • Make a clean checkout of Gora trunk e.g.
      git clone
    (ensuring that there are no local modifications).
  • Build the project, running tests e.g.
      mvn clean package
  • At this stage it might be best to run the example from the main Gora tutorial.
  • Edit to reflect the current release (please include release report from JIRA as well as a link to the JIRA release report), this may also be required for other essential files such as, etc. Ensure all of these files are accurate and up-to-date. It is also advised to include the JIRA release report in, This makes it very easy for people to see the relevant changes for this release.
  • If you have never made a Gora release, you are required to append your gpg key to the Gora KEYS file, this will then be used to sign all release artifacts. Much more about this can be found here N.B. This is extremely important.
  • For Gora Gradle plugin edit the "version" attribute in gora-gradle-plugin/
  • Commit these changes. If you do not do this the next stage will not work.
  • Run the following e.g.
      mvn release:clean release:prepare -DautoVersionSubmodules=true -DdryRun=true
    The above makes life very very easy for us and
    • cleans out all release-based module directories, and,
    • prepares us for a release, making explicit calls to state that we have a multi-module project, and that this is a dry run. Running without the latter can mess up our SCM! Although we've already checked that tests pass, the maven-release plugin wants to do another test run, just to verify that we are not releasing broken code to tag area which increases the workload.
  • Check all Maven release artifacts produced as output, we wish to iron out any discrepancies at this stage. This includes looking in to the propose pom.xml files as well as any MANIFEST entries, etc. N.B. This is imperative.

Making the release

If you are happy with the proposed release artifacts then we can now move on to dropping the dryRun profile like so:

  • mvn release:clean release:prepare -DautoVersionSubmodules=true

This will allow you to view the actual release artifacts.

  • mvn release:perform

This does the following

Once this has completed,

  • navigate to and log in.
  • click on Staging Repositories on the left hand side, you should see the gora RC staging profile.
  • Select the profile and close the staging profile. This makes the artifacts available for people to tests and VOTE upon.

Push the source release artifacts and signatures to

Check out Gora release staging area. The artifacts we push to this area are the ones we make available on official

Apache mirriors. These are therefore the sources artifacts we link to from the Gora site. e.g.

  • In your local copy of Gora master, navigate to $GORA_HOME/target directory and copy the src.tar.gz and artifacts along with relevant signatures to the above release staging directory.
  • You should aim to include all relevant signatures along with these src artifacts. This would entail MD5, SHA and ASC signatures for each artifact. More information on this can be found here -
  • copy the to this directory as well
  • finally, svn add all of the above artifacts and commit them to the gora dev release staging area

Next, progress to the creation of the VOTE thread as below...

Prepare the VOTE thread based on the artifacts

Send something like the following to the user@ and dev@gora lists

VOTE email
To: "Apache Gora Developers List" <>, "Apache Gora User List" <>
 Subject: VOTE Release Apache Gora X.Y

Hi Folks,
I am very happy to get a VOTE out for Apache Gora 0.5 Release Candidate.

We solved 44 issues:

Git source tag (c2d58dd1440b4e2c66c1f40a4b6d4169d79bb6d3):

Staging repo:

Source Release Artifacts:

PGP release keys (signed using 48BAEBF6):

Vote will be open for 72 hours.
Thank you to everyone that is able to VOTE as well as everyone that contributed to Apache Gora 0.5.

[ ] +1, let's get it released!!!
[ ] +/-0, fine, but consider to fix few issues before...
[ ] -1, nope, because... (and please explain why)

The above email includes the following

  • A link to the JIRA Release Report... this is critical for making it explicit what was addressed in this particular development drive.
  • The SVN tag created by the mvn release plugin
  • A link to the (closed) staging repository on
  • Link to the official release artifacts
  • The KEYS file used containing developer signatures. This should be used to check signatures of release artifacts.

Double check the accuracy of this email and ship it to the masses!!!



Preparing for new development

Send out the RESULT thread

After the 72 hours waiting time, it is down to the release manager to close the VOTE thread. This is usually

done by replying to the VOTE thread but changing the title to the following

RESULT thread
Subject: [RELEASE] WAS:VOTE Release Apache Gora X.Y
The RESULT thread should basically tally up the VOTE's something like the following would do nicely
Hi Everyone, 
 As the 72 hours period has come and gone I would like to bring this thread to a close. 
The VOTE's have been counted and RESULT's are as follows 
 [7] +1, let's get it released!!! 
Henry Saputra * 
Renato Marroquín Mogrovejo * 
Apostolis Giannakidis * 
Talat Uyarer 
Alparslan Avci * 
Akber Choudhry 
Lewis John McGibbney * 
[0] +/-0, fine, but consider to fix few issues before... 
[0] -1, nope, because... (and please explain why) 
 *Gora PMC Binding VOTE 
 I'll progress with the remainder of the release procedure. 


If the release passes, progress to the next step, if not then head over to dev@gora and discuss

how to revert the release. Assuming it passes however, progress to the next section.

Release the staging repos

Navigate to and find the (closed) staging repos. Release this repository into Apache Nexus. This will be pulled into Maven Central and in 12 or do hours the release artifacts should be available at the following link -

Release the Source Artifacts

Make sure that the up-to-date KEYS file exists in

Once all artifacts and signatures have been copied over, delete the dev area

The release artifacts will be copied over to in due course and available for public download.

Update the Website to reflect the release

This can be done easily by editing the News feed on the main page as well as the downloads.html page.

It is important that all links on downloads.html are accurate including the signatures links. Also the PGP

key reference to the signed artifacts should be updated to reflect the release managers KEY.

Release the Gradle Plugin

For the Gradle plugin, run the following

cd gora-gradle-plugin; ./gradlew clean assemble

This command will

  • Download Gradle Wrapper
  • Launch compile and assemble Gradle tasks
  • Artifacts will be stored in build/libs

Then run the following :

./gradlew clean publishPlugins


You will need credentials for this step. Please contact Damien Raude-Morvan for this purpose.

This does the following

Announce the Release


Hi Folks,

The Apache Gora team are pleased to announce the immediate availability of Apache Gora 0.6.

The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop™ MapReduce support. Gora uses the Apache Software License v2.0.

Gora is released as both source code, downloads for which can be found at our downloads page [0] as well as Maven artifacts which can be found on Maven central [1].
The DOAP file for Gora can be found here [2] 

This release addresses a modest XXXXX issues with ... blah blah blah. The full Jira release report can be found here [3].

Suggested Gora database support is as follows

Apache Avro 1.7.6
Apache Hadoop 1.2.1 and 2.5.2
Apache HBase 0.98.8-hadoop2
Apache Cassandra 2.0.2
Apache Solr 4.10.3
MongoDB 2.6.X
Apache Accumlo 1.5.1

Thank you


(on behalf of Gora PMC)

[3] URL for Release Report in Jira


  • Send an ANNOUNCEMENT to the following lists
    • HBase User -
    • Accumulo User -
    • Cassandra User -
    • Hector User -!forum/hector-users
    • Avro User -
    • Giraph User -
    • DynamoDB Forum -
    • Solr User -
    • MongoDB User -!forum/mongodb-user
    • Nutch User -
    • Finally the most important internal Apache Announcement list -

Prepare for Next Development

  • In the JIRA Administration Interface, go to
    • Versions
    • for the release tag you've just released, add a release date and then release it
  • Update the DOAP to reflect the release
  • File new issues over on JIRA for NUTCH, GIRAPH, CAMEL and CHUKWA. These projects consume Gora and it is through them that we can further improve Gora.

Thats about it folks... start on the next development drive.


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