dasahcc commented on a change in pull request #1064:
URL: https://github.com/apache/helix/pull/1064#discussion_r435660239



##########
File path: helix-core/src/main/java/org/apache/helix/task/TaskDriver.java
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@@ -403,6 +403,14 @@ public void enqueueJobs(final String queue, final 
List<String> jobs,
       }
     }
 
+    // Fail the operation if adding new jobs will cause the queue to reach its 
capacity limit

Review comment:
       It solved part of the problem. I think it still could cause race 
condition when there is another thread submitting jobs. We should make this 
operation as a transaction. It means when we update the Workflow Config with 
job dag. If it exceeds the capacity, we should remove all the jobconfigs.




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