xingchun-chen opened a new issue #2104: [1.2.0_release] if / else's else node 
depends on multiple nodes, do you need to execute the else node?  
URL: https://github.com/apache/incubator-dolphinscheduler/issues/2104
 
 
   As shown in the following figure: after the if / else node fails, the 
after_3 node will not be executed, but the after_3 node depends on the shell_2 
node. After shell_2 is successfully executed, after_3 is also successfully 
executed, but after_4 is not executed.
   
   The requirements are to be determined: 
               1. After the if / else node fails, does after_3 need to be 
executed again?
               2.After the execution of after_3 is successful, do you need to 
wait for after_2 and after_4 to execute successfully at the same time before 
executing merge_1?
   
如下图所示:if/else节点失败后,不会执行after_3节点,但是after_3节点依赖shell_2节点,shell_2执行成功后,after_3也执行成功,after_4却没有执行
   
   需求待确定:1. if/else节点失败后,after_3是否需要再执行
                        2.after_3执行成功后,是否需要等after_2和after_4同时执行成功后,再执行merge_1
   
![image](https://user-images.githubusercontent.com/55787491/76073886-519ae580-5fd5-11ea-8189-2b5e7b424bfa.png)
   
   **Which version of Dolphin Scheduler:**
    -[[1.2.0_release]]
   

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