autumnust opened a new pull request #2789: [GOBBLIN-940]Add synchronization on workunit persistency before Helix job launching URL: https://github.com/apache/incubator-gobblin/pull/2789 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 - [x] https://issues.apache.org/jira/browse/GOBBLIN-940 ### Description - [x] Did some minor refactoring and unit test fixing, the major part is just adding `waitForTasks ` before Helix job being returned and submitted. This is causing problem when HDFS being very slow / parallel runner hitting CPU bounded on working on workunit persistency that Helix task is activated before WU is showing up. ### Tests - [x] 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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