hfutatzhanghb opened a new pull request, #6475:
URL: https://github.com/apache/hadoop/pull/6475

   ### Description of PR
   HDFS-17345.
   Currently, we have block report send time metrics recorded by blockReports.
   
   We should better add another metric to record block report creating cost 
time:
   
   `long brCreateCost = brSendStartTime - brCreateStartTime; `
   It is useful for us to measure the perfomance of creating block reports.
   
   


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