[GitHub] [hadoop] jojochuang commented on pull request #4107: HDFS-16521. DFS API to retrieve slow datanodes

[GitBox <gi...@apache.org>]

jojochuang commented on pull request #4107:
URL: https://github.com/apache/hadoop/pull/4107#issuecomment-1084132385


   I've wanted to build a UI to expose the slow datanode metrics more easily. For example at the NameNode itself or in Cloudera Manager Chart System. Never got the time to make one.
   
   But the biggest complaint from the users was that it is disabled by default and it's annoying to restart the cluster just to refresh the configuration and wait for the slow node to show up again. It would be much more useful it can be made available on demand at runtime.


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