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https://issues.apache.org/jira/browse/HDFS-16582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17538569#comment-17538569
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Viraj Jasani commented on HDFS-16582:
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FYI [~stack]
> Expose aggregate latency of slow node as perceived by the reporting node
> ------------------------------------------------------------------------
>
> Key: HDFS-16582
> URL: https://issues.apache.org/jira/browse/HDFS-16582
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
>
> When any datanode is reported to be slower by another node, we expose the
> slow node as well as the reporting nodes list for the slow node. However, we
> don't provide latency numbers of the slownode as reported by the reporting
> node. Having the latency exposed in the metrics would be really helpful for
> operators to keep a track of how far behind a given slow node is performing
> compared to the rest of the nodes in the cluster.
> The operator should be able to gather aggregated latencies of all slow nodes
> with their reporting nodes in Namenode metrics.
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