Viraj Jasani created HDFS-16582:
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Summary: 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
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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