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Make sure you are working with a clean repo (i.e. identical to upstream - no changes in progress). If needed clone a fresh copy
git checkout trunk
Check that current HEAD points to commit on which you want to base new release branch. Checkout particular commit if not.
git branch 0.10.0
git push apache 0.10.0
Modify the version in trunk to bump to the next one (eg. "0.10.1.0-SNAPSHOT") in the following files:
- docs/js/templateData.js
- gradle.properties
- kafka-merge-pr.py
- streams/quickstart/java/pom.xml
- streams/quickstart/java/src/main/resources/archetype-resources/pom.xml
- streams/quickstart/pom.xml
- tests/kafkatest/__init__.py
- tests/kafkatest/version.py (do not add the new release version, it will only be added after the release is completed)
Commit and push to trunk in apache.
Check that the branch was correctly propagated to Apache using the webui: https://gitbox.apache.org/repos/asf?p=kafka.git
Update the Jenkins configuration to include the newly created branch (if it's not there already) in the section shown in the following screenshot. If you don't have permission to create apache job, please ask Jun Rao to give you access.

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It may also be worth tackling the compatibility/upgrade system tests as mentioned above.

Please file Jira tickets to remind teams to update their system tests (eg https://issues.apache.org/jira/browse/KAFKA-15672 – similar for others)

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