Suresh Srinivas created HDFS-4921:
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Summary: 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
The only way to determine a feature is turned on or off is to look at namenode
logs or configuration. Some time 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 if a 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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