enjoyear opened a new pull request #2818: [GOBBLIN-963] Remove duplicated 
copies of TaskContext/TaskState when constructing TaskIFaceWrapper
URL: https://github.com/apache/incubator-gobblin/pull/2818
 
 
   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] My PR addresses the following [Gobblin 
JIRA](https://issues.apache.org/jira/browse/GOBBLIN/) issues and references 
them in the PR title. For example, "[GOBBLIN-963] My Gobblin PR"
       - https://issues.apache.org/jira/browse/GOBBLIN-963
   
   
   ### Description
   - [X] Here are some details about my PR, including screenshots (if 
applicable):
   Currently in GobblinMultiTaskAttempt, when we call createTaskRunnable, we 
rely on a TaskFactory to create a task and return a wrapper for that task. 
However, when we create the wrapper, we initialized the TaskContext twice. 
   
   For the task creation
   For the task wrapper creation
   These two TaskContexts, which generate two copies of TaskState, will cause 
inconsistency in the following operation. The task state update within the task 
won't be reflected in TaskWrapper.
   
    
   
   Specifically, this is the buggy line of code
   ```java
   return new TaskIFaceWrapper(taskFactoryOpt.get().createTask(new 
TaskContext(workUnitState)),
    new TaskContext(workUnitState), countDownLatch, this.taskStateTracker);
   ```
   Ideally, we should create the TaskContext once, and reuse the same 
TaskContext.
   
   ### Tests
   - [X] My PR adds the following unit tests __OR__ does not need testing for 
this extremely good reason:
   
   
   ### Commits
   - [X] 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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