[jira] [Created] (HDFS-12661) Ozone: Support optional documentation link in KSM/SCM webui

["Elek, Marton (JIRA)" <ji...@apache.org>]

Elek, Marton created HDFS-12661:
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             Summary: Ozone: Support optional documentation link in KSM/SCM webui
                 Key: HDFS-12661
                 URL: https://issues.apache.org/jira/browse/HDFS-12661
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone
    Affects Versions: HDFS-7240
            Reporter: Elek, Marton
            Assignee: Elek, Marton


In some cases it could be useful to include additional documentation to the SCM/KSM web ui.

This patch includes an optional hook. During the startup scm/ksm web ui do a HTTP HEAD request and if docs/index.html exists, an additional Documentation link will be displayed in the menu header. 

Long term we can generate documentation automatically from the source. 

Testing:

Do a full build, start scm: no link in the ui.

Add some optional documentation (choose one):
* hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/scm/docs/index.html (before build)
* hadoop-hdfs-project/hadoop-hdfs/target/webapps/scm/docs/index.html (after clean, before build)
* hadoop-dist/target/hadoop-3.1.0-SNAPSHOT/share/hadoop/hdfs/webapps/scm/docs/index.html (after build)

And start scm again. There should be a documentation link in the menu which opens the optional documentation.



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