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https://issues.apache.org/jira/browse/HDFS-17840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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terrytlu updated HDFS-17840:
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Attachment: image-2025-09-23-11-34-26-420.png
> The "Nodes in Service" information is incorrect under DFS Storage Types in
> NameNode UI
> --------------------------------------------------------------------------------------
>
> Key: HDFS-17840
> URL: https://issues.apache.org/jira/browse/HDFS-17840
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: terrytlu
> Priority: Major
> Attachments: image-2025-09-23-11-34-05-562.png,
> image-2025-09-23-11-34-26-420.png
>
>
> We found in a hadoop cluster, which has 26 nodes, while in NameNode UI, only
> show 3 nodes
> !image-2025-09-23-11-25-25-313.png|width=694,height=124!
> we found the problem still exists after merge
> https://issues.apache.org/jira/browse/HDFS-16402
>
>
>
> Since the metrics here are calculated using real-time increments and
> decrements, once a metric is corrupted, it cannot be restored. We recommend
> modifying the implementation to retrieve the data from
> org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager#datanodeMap to
> ensure a consistent number of nodes in service.
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