[GitHub] [hadoop] tasanuma commented on pull request #3654: HDFS-16320. Datanode retrieve slownode information from NameNode

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tasanuma commented on pull request #3654:
URL: https://github.com/apache/hadoop/pull/3654#issuecomment-972729867


   @symious Thanks for submitting the PR and sharing your document. I think it's a good solution too.
   
   > The configuration for this solution is “dfs.namenode.block-placement-policy.exclude-slow-nodes.enable”. But this solution doesn’t help with the clients already using the slownode.
   
   I want to clarify about "the clients already using the slownode". Does it mean the case that the DataNode is not a slownode when the client starts writing the file, but it becomes a slownode while the client is writing the file? Does it happen often?


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