duhengforever opened a new pull request #358: [ISSUE #292] Add support of transactional message feature URL: https://github.com/apache/rocketmq/pull/358 Please do not create a Pull Request without creating an issue first. ## What is the purpose of the change In order to implement eventual consistency in distributed system, we define a new type of message named transactional message, it can be thought of as a two-phase commit message implementation to ensure eventual consistency in distributed system. Transactional message ensures that the execution of local transaction and the sending of message can be performed atomically. ## Brief changelog In our implementation, we made full use of the mechanism of rocketMQ itself to avoid external dependencies, and we defined a pair of message: named half message and commit/rollback message. Half message means prepared message, which are not visible to consumers，and it will be sent before local transaction is executed. After the local transaction ends，producer will send a commit or rollback message to broker based on local transaction execution result ## Verifying this change This is a trivial change. Follow this checklist to help us incorporate your contribution quickly and easily: - [x] Make sure there is a Github issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a Github issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue. - [x] Format the pull request title like `[ISSUE #123] Fix UnknownException when host config not exist`. Each commit in the pull request should have a meaningful subject line and body. - [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why. - [x] Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in [test module](https://github.com/apache/rocketmq/tree/master/test). - [x] Run `mvn -B clean apache-rat:check findbugs:findbugs checkstyle:checkstyle` to make sure basic checks pass. Run `mvn clean install -DskipITs` to make sure unit-test pass. Run `mvn clean test-compile failsafe:integration-test` to make sure integration-test pass. - [x] If this contribution is large, please file an [Apache Individual Contributor License Agreement](http://www.apache.org/licenses/#clas).
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