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https://issues.apache.org/jira/browse/HDFS-4921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13813697#comment-13813697
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Vivek Ganesan commented on HDFS-4921:
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Do we need a separate page for this? or do we need a unified REST API?
> Create a web page to display the namenode features and whether they are
> turned on or off
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-4921
> URL: https://issues.apache.org/jira/browse/HDFS-4921
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Suresh Srinivas
> Assignee: Vivek Ganesan
>
> The only way to determine a feature is turned on or off is to look at
> namenode logs or configuration. Some times when features change/modified
> (short circuit for example), the corresponding log message changes or goes
> from info to debug etc. Logs are not a reliable way to programmatically, for
> example in tests, to determine if a feature is turned on/off.
> Also when debugging issues, routinely I have to ask for configuration to
> determine if the feature is turned on or off and hope that the configuration
> provided is the correct one loaded in the namenode.
> While namenode does provide config it has loaded over http, some times either
> due to poor documentation or lack of understanding of configuration
> mechanism, people may not be able to determine the state of the feature. I
> propose adding a web page that shows all that we print today in the logs,
> that feature status and the corresponding configuration values and feature
> status. This should also be made available over JMX and JMX http, just like
> all the other namenode webUI info, so that scripts and other programs can
> consume it.
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