[GitHub] [incubator-dolphinscheduler] lenboo opened a new issue #2207: [Feature]the fetchTaskThread cost too much time

Tue, 17 Mar 2020 00:21:21 -0700 

lenboo opened a new issue #2207: [Feature]the fetchTaskThread cost too much time
URL: https://github.com/apache/incubator-dolphinscheduler/issues/2207
 
 
   **Is your feature request related to a problem? Please describe.**
   1.2.0-release
   1. start 3 workers and 1 masters
   2. create a workflow with 3K tasks 
   3. when running the workflow, i find  of the time is spent on the 
"fetchtaskthread" thread, and a large number of tasks are backlog in the ZK 
queue.
   
![image](https://user-images.githubusercontent.com/29528966/76831387-3300de00-6862-11ea-9a11-bcee4bd99cd6.png)
   
   4. throng "arthas", i find some situations:
   
![image](https://user-images.githubusercontent.com/29528966/76831481-63487c80-6862-11ea-90d5-e24e521e34b9.png)
   
   so i think we should  use less database and ZK interaction in 
"fetchtaskthread".
   

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