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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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Wei-Chiu Chuang reassigned HDFS-14780:
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Assignee: HaiBin Huang
> 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
>
>
> 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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