[GitHub] [hadoop] virajjasani opened a new pull request #4107: HDFS-16521. DFS API to retrieve slow datanodes

[GitBox]

virajjasani opened a new pull request #4107:
URL: https://github.com/apache/hadoop/pull/4107


   ### Description of PR
   In order to build some automation around slow datanodes that regularly show 
up in the slow peer tracking report, e.g. decommission such nodes and queue 
them up for external processing and add them back later to the cluster after 
fixing issues etc, we should expose DFS API to retrieve all slow nodes at a 
given time.
   
   Providing such API would also help add an additional option to "dfsadmin 
-report" that lists slow datanodes info for operators to take a look, 
specifically useful filter for larger clusters.
   
   ### How was this patch tested?
   Dev cluster:
   <img width="506" alt="Screenshot 2022-03-25 at 8 44 42 PM" 
src="https://user-images.githubusercontent.com/34790606/160162198-f7629df2-81a2-48f8-97bd-14d16855d03b.png";>
   
   <img width="524" alt="Screenshot 2022-03-25 at 9 12 58 PM" 
src="https://user-images.githubusercontent.com/34790606/160162218-b76f62eb-0f32-4d92-bc58-c2cbbe2c4848.png";>
   
   
   ### For code changes:
   
   - [X] Does the title or this PR starts with the corresponding JIRA issue id 
(e.g. 'HADOOP-17799. Your PR title ...')?
   


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