autumnust opened a new pull request #2919: [GOBBLIN-1078] Coordination between task cancel and initialization in Helix Task URL: https://github.com/apache/incubator-gobblin/pull/2919 Dear Gobblin maintainers, Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below! ### JIRA - https://issues.apache.org/jira/browse/GOBBLIN-1078 ### Description The task cancel and task.run is called in different thread from helix side, which introduced problems when: - Task get cancelled for some reasons from Helix side, therefore calling `SingleTask#cancel ` - However, TaskAttempt object within SingleTask has not been initialized, therefore it didn't pass the non-null checking and only prints a log. After that, the run method in different thread start to run and never get cancelled. This sequence could result in violation of helix quota in each participant: While helix believe there's no partition assigned to a participant and assign a new partition, the previous not-yet-cancelled partition is still running. We added a barrier in cancel method to ensure cancel is blocked if taskAttempt object is not yet being initialized. Added unit test to simulate the sequence as well. ### Tests - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: ### Commits - [ ] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 2. Subject is limited to 50 characters 3. Subject does not end with a period 4. Subject uses the imperative mood ("add", not "adding") 5. Body wraps at 72 characters 6. Body explains "what" and "why", not "how"
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