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Posted to hdfs-dev@hadoop.apache.org by "Haohui Mai (JIRA)" <ji...@apache.org> on 2014/10/13 23:07:36 UTC

[jira] [Created] (HDFS-7239) Create a servlet for HDFS UI

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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