haiyang1987 opened a new pull request, #6109:
URL: https://github.com/apache/hadoop/pull/6109

   ### Description of PR
   https://issues.apache.org/jira/browse/HDFS-17208
   
   Consider should add the metrics `PendingAsyncDiskOperations` to be able to 
track if we are queueing too many asynchronous disk operations in 
FsDatasetAsyncDiskService of the datanode.
   
   
   


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