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https://issues.apache.org/jira/browse/HDFS-14780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haibin Huang updated HDFS-14780:
--------------------------------
    Attachment: HDFS-14780.001.patch

> add ReportingNode to make the information of SlowPeersReport in namenode's 
> jmx more specific
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-14780
>                 URL: https://issues.apache.org/jira/browse/HDFS-14780
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Haibin Huang
>            Assignee: Haibin Huang
>            Priority: Major
>         Attachments: HDFS-14780, HDFS-14780.001.patch
>
>
> I found *SlowPeersReport* in namenode's jmx is too simple, so i make an  
> inner class called 
> org.apache.hadoop.hdfs.server.blockmanagement.SlowPeerTracker.*ReportingNode* 
> to make SlowPeersReport's information more specific.Here is an example, the 
> old SlowPeersReport maybe like this:
>  
> {code:java}
> "SlowPeersReport" 
> :[{"SlowNode":"node4","ReportingNodes":["node1"]},{"SlowNode":"node2","ReportingNodes":["node1","node3"]},{"SlowNode":"node1","ReportingNodes":["node2"]}]{code}
>  
> we can see that the old SlowPeersReport just can tell you who is reporting 
> the slownode, actually we can get more information by using the  inner class 
> *ReportingNode* :
>  
> {code:java}
> "SlowPeersReport" 
> :[{"SlowNode":"node4","ReportingNodes":[{"nodeId":"node1","averageDelay":2000.0,"reportTime":"Tue
>  Aug 27 16:44:49 CST 
> 2019"}]},{"SlowNode":"node2","ReportingNodes":[{"nodeId":"node1","averageDelay":2000.0,"reportTime":"Tue
>  Aug 27 16:44:49 CST 
> 2019"},{"nodeId":"node3","averageDelay":1000.0,"reportTime":"Tue Aug 27 
> 16:44:49 CST 
> 2019"}]},{"SlowNode":"node1","ReportingNodes":[{"nodeId":"node2","averageDelay":2000.0,"reportTime":"Tue
>  Aug 27 16:44:49 CST 2019"}]}]{code}
>  
> we can know the *averageDelay* of reportingnode sending packet to slownode, 
> and the *reportTime* can tell us when this message reporting to namenode.I 
> think these message will be helpful for us to analyze the slownode problem.



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