liubingxing opened a new pull request #3907:
URL: https://github.com/apache/hadoop/pull/3907


   JIRA: [HDFS-16432](https://issues.apache.org/jira/browse/HDFS-16432)
   
   
![image](https://user-images.githubusercontent.com/2844826/150293279-07d7bbf0-1471-464f-af81-7d5c23aeadcd.png)
   
   In our cluster, namenode block report will held write lock for a long time 
if the storage block number more than 100000. 
   So we want to add a yield mechanism in block reporting process to avoid 
holding write lock too long.


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