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zhu commented on HDFS-15974: ---------------------------- Thank you [~elgoiri]. The function GetEnteringMaintenanceNodes returns " N/A " , which will cause the page parsing Json exception . I think this function returns null to solve the problem, and my test is exactly that. *The debug exception is as follows:* SyntaxError: Unexpected token N in JSON at position 0 at JSON.parse (<anonymous>) at workaround (federationhealth.js:321) at Object.<anonymous> (federationhealth.js:398) at Object.success (federationhealth.js:504) at c (jquery-3.5.1.min.js:2) at Object.fireWith [as resolveWith] (jquery-3.5.1.min.js:2) at l (jquery-3.5.1.min.js:2) at XMLHttpRequest.<anonymous> (jquery-3.5.1.min.js:2) !image-2021-04-15-11-36-47-644.png! > RBF: Unable to display the datanode UI of the router > ---------------------------------------------------- > > Key: HDFS-15974 > URL: https://issues.apache.org/jira/browse/HDFS-15974 > Project: Hadoop HDFS > Issue Type: Bug > Components: rbf, ui > Affects Versions: 3.4.0 > Reporter: zhu > Priority: Major > Attachments: HDFS-15358-1.patch, image-2021-04-15-11-36-47-644.png > > > Clicking the Datanodes tag on the Router UI does not respond. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org