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https://issues.apache.org/jira/browse/HDFS-15745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17309362#comment-17309362
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Haibin Huang commented on HDFS-15745:
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Thanks [~prasad-acit] for comment, i have update this patch for branch 3.1 &
3.2 &3.3, [~ayushtkn] would you mind commit them?
> Make DataNodePeerMetrics#LOW_THRESHOLD_MS and MIN_OUTLIER_DETECTION_NODES
> configurable
> --------------------------------------------------------------------------------------
>
> Key: HDFS-15745
> URL: https://issues.apache.org/jira/browse/HDFS-15745
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Haibin Huang
> Assignee: Haibin Huang
> Priority: Major
> Fix For: 3.4.0
>
> Attachments: HDFS-15745-001.patch, HDFS-15745-002.patch,
> HDFS-15745-003.patch, HDFS-15745-branch-3.1.001.patch,
> HDFS-15745-branch-3.2.001.patch, HDFS-15745-branch-3.3.001.patch,
> image-2020-12-22-17-00-50-796.png
>
>
> When i enable DataNodePeerMetrics to find slow slow peer in cluster, i found
> there is a lot of slow peer but ReportingNodes's averageDelay is very low,
> and these slow peer node are normal. I think the reason of why generating so
> many slow peer is that the value of DataNodePeerMetrics#LOW_THRESHOLD_MS is
> too small (only 5ms) and it is not configurable. The default value of slow io
> warning log threshold is 300ms, i.e.
> DFSConfigKeys.DFS_DATANODE_SLOW_IO_WARNING_THRESHOLD_DEFAULT = 300, so
> DataNodePeerMetrics#LOW_THRESHOLD_MS should not be less than 300ms, otherwise
> namenode will get a lot of invalid slow peer information.
> !image-2020-12-22-17-00-50-796.png!
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