[GitHub] [hadoop] liubingxing edited a comment on pull request #3907: HDFS-16432. Namenode block report add yield to avoid holding write lo…

Tue, 08 Feb 2022 23:38:21 -0800 


liubingxing edited a comment on pull request #3907:
URL: https://github.com/apache/hadoop/pull/3907#issuecomment-1033432213


    Hi @sodonnel, I have tried reproducing this problem on a test cluster and 
the cpu profile of block report process look like as follow.
   
![image](https://user-images.githubusercontent.com/2844826/153139265-e0780e60-c924-4720-8680-16f1dfebac3c.png)
   
![image](https://user-images.githubusercontent.com/2844826/153139376-f57b4ab4-e153-4ca3-819c-95afb49e313f.png)
   
![image](https://user-images.githubusercontent.com/2844826/153139426-48d27252-4367-4e9f-9457-1e128789a0b1.png)
   
   It looks like most of the time were taking by the #processReportedBlock and 
#moveBlockToHead, and the #moveBlockToHead is necessary after removing the 
folded tree set structure.
   If you have any good suggestions, please let me know.


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