alirezazamani opened a new issue #1365:
URL: https://github.com/apache/helix/issues/1365


   ### Describe the bug
   The issue is related to the nature of Helix/ZK and can be reproduced if the 
user adds jobs in a loop. So if this is the behavior, it is better to do batch 
job addition. So let's say a user is adding jobs one by one. Let's say the user 
is job1, job2, and job3.
   At T1: Job1 and job2 are added and jobDAG is changed.
   At T2: We get children of config and know new configs of job1 and job2 and 
change in DAG.
   At T3: job3 is added and is being added to DAG.
   At T4: Refresh is started and the controller sees config of job1, job2 and 
DAG will be Job1, job2, and job3.
   Now in the pipeline, since we see job3 in the DAG and we do not see config, 
we purge job3 and remove config from ZK. Hence job3 will not be finished at all.
   
   ### To Reproduce
   Add multiple jobs in a loop
   
   ### Expected behavior
   Jobs should be executed and such race conditions should be avoided.
   


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