Haohui Mai created HDFS-7239:
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Summary: Create a servlet for HDFS UI
Key: HDFS-7239
URL: https://issues.apache.org/jira/browse/HDFS-7239
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Haohui Mai
Assignee: Haohui Mai
Currently the HDFS UI gathers most of its information from JMX. There are a
couple disadvantages:
* JMX is also used by management tools, thus Hadoop needs to maintain
compatibility across minor releases.
* JMX organizes information as <key, value> pairs. The organization does not
fit well with emerging use cases like startup progress report and nntop.
This jira proposes to introduce a new servlet in the NN for the purpose of
serving information to the UI.
It should be viewed as a part of the UI. There is *no* compatibility guarantees
for the output of the servlet.
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