Rubik-W opened a new issue #2174: [BUG] MasterExecThread NullPointException
URL: https://github.com/apache/incubator-dolphinscheduler/issues/2174
 
 
   **Describe the bug**
   When the number of parallel tasks exceeds the set number of threads, there 
are tasks waiting to be submitted to the database, These tasks have not been 
assigned a task ID.
   Failed task at this point, master server will kill running tasks, 
killTheOtherTasks method will get NullPointException.
   
   ```
               TaskInstance taskInstance = taskExecThread.getTaskInstance();
               taskInstance = 
processService.findTaskInstanceById(taskInstance.getId());
               if(taskInstance.getState().typeIsFinished()){
                   continue;
               }
   ```

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