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https://issues.apache.org/jira/browse/HDFS-15754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun resolved HDFS-15754.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
> Create packet metrics for DataNode
> ----------------------------------
>
> Key: HDFS-15754
> URL: https://issues.apache.org/jira/browse/HDFS-15754
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> In BlockReceiver, right now when there is slowness in writeToMirror,
> writeToDisk and writeToOsCache, it is dumped in the debug log. In practice we
> have found these are quite useful signal to detect issues in DataNode, so it
> will be great these metrics can be exposed by JMX.
> Also we introduced totalPacket received to use a percentage as a signal to
> detect the potentially underperforming datanode since datanodes across one
> HDFS cluster may received different numbers of packets totally.
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