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https://issues.apache.org/jira/browse/HBASE-29775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18047747#comment-18047747
]
JinHyuk Kim commented on HBASE-29775:
-------------------------------------
Tested with CLI
{code:java}
$ ./bin/hbase org.apache.hadoop.hbase.http.log.LogLevel -setlevel
localhost:16010 org.apache.hadoop.hbase.http.log.LogLevel WARN
Connecting to
http://localhost:16010/logLevel?log=org.apache.hadoop.hbase.http.log.LogLevel&level=WARN
Exception in thread "main" java.io.IOException: HTTP status [403], message
[Modification of HBase via the UI is disallowed in configuration.], URL
[/logLevel], exception [Error 403 Modification of HBase via the UI is
disallowed in configuration.]
at
org.apache.hadoop.hbase.http.log.LogLevelExceptionUtils.validateResponse(LogLevelExceptionUtils.java:76)
at
org.apache.hadoop.hbase.http.log.LogLevel$CLI.fetchResponse(LogLevel.java:279)
at
org.apache.hadoop.hbase.http.log.LogLevel$CLI.fetchSetLevelResponse(LogLevel.java:235)
at
org.apache.hadoop.hbase.http.log.LogLevel$CLI.doSetLevel(LogLevel.java:231)
at
org.apache.hadoop.hbase.http.log.LogLevel$CLI.sendLogLevelRequest(LogLevel.java:125)
at org.apache.hadoop.hbase.http.log.LogLevel$CLI.run(LogLevel.java:107)
at org.apache.hadoop.hbase.http.log.LogLevel.main(LogLevel.java:71)
{code}
> Allow inspecting log levels in Master UI in read-only mode
> ----------------------------------------------------------
>
> Key: HBASE-29775
> URL: https://issues.apache.org/jira/browse/HBASE-29775
> Project: HBase
> Issue Type: Bug
> Components: UI
> Reporter: JinHyuk Kim
> Assignee: JinHyuk Kim
> Priority: Minor
> Labels: pull-request-available
> Attachments: screenShot 2025-12-12 pm 11.24.40.png, screenShot
> 2025-12-13 12.20.50.png, screenShot 2025-12-13 12.29.05.png, screenShot
> 2025-12-13 12.29.17.png
>
>
> h2. *Description*
> When {{hbase.master.ui.readonly}} is set to {{true}}, the HBase Master UI is
> intended to operate in a read-only mode, preventing any state-changing
> operations through the UI.
> However, in the current behavior, the log level page becomes completely
> inaccessible in read-only mode. This makes it impossible to *check* the
> current log level configuration, even though checking log levels is a purely
> observational operation and does not modify system state.
> h3. *Current Behavior*
> * When {{hbase.master.ui.readonly=true}}
> ** Access to the log level page is blocked entirely
> ** Users cannot check current log levels
> ** !screenShot 2025-12-12 pm 11.24.40.png|width=581,height=138!
> h3. *Expected Behavior*
> * When {{hbase.master.ui.readonly=true}}
> ** Users *can check* the current log levels
> ** Any attempt to *modify* log levels via the UI should remain rejected
> h3. *Change Summary*
> Allows access to the log level page in master UI read-only mode for
> {*}checking purposes only{*}.
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