[GitHub] [hadoop] liangxs commented on pull request #3080: HADOOP-17749. Remove lock contention in SelectorPool of SocketIOWithTimeout

[GitBox]

liangxs commented on pull request #3080:
URL: https://github.com/apache/hadoop/pull/3080#issuecomment-864899799


   I execute this command in my product environment:
   ```
   for i in `seq 1 20`; do jstack 23730 > d.jstack.`date +%H%M%S` ; sleep 1; 
done &> /dev/null
   
   ```
   
   
   20 jstack files are generated:
   
![image](https://user-images.githubusercontent.com/4401756/122742178-44803380-d2b8-11eb-9531-f82c72ceab73.png)
   
   
   Most of the lock contentions are about SelectPool:
   
![image](https://user-images.githubusercontent.com/4401756/122742317-6679b600-d2b8-11eb-9644-1dae1633508a.png)
   


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