[jira] [Commented] (HBASE-21521) Expose master startup status via JMX and web UI

["Xiaolin Ha (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17600662#comment-17600662 ] 

Xiaolin Ha commented on HBASE-21521:
------------------------------------

This is a very helpful issue. We can use info showed by it to improve the startup progress of the Master, especially for a whole cluster failure, with a lot of regionservers crashed. [~shahrs87] , is there any progress?

> Expose master startup status via JMX and web UI
> -----------------------------------------------
>
>                 Key: HBASE-21521
>                 URL: https://issues.apache.org/jira/browse/HBASE-21521
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, UI
>            Reporter: Andrew Kyle Purtell
>            Assignee: Rushabh Shah
>            Priority: Major
>         Attachments: hbase-21521-1.png, hbase-21521-2.png, hbase-21521-3.png, hbase-21521-4.png, hbase-21521-revised-1.png, hbase-21521-revised-2.png
>
>
> Add an internal API to the master for tracking startup progress. Expose this information via JMX.
> Modify the master to bring the web UI up sooner. Will require tweaks to various views to prevent attempts to retrieve state before the master fully up (or else expect NPEs). Currently, before the master has fully initialized an attempt to use the web UI will return a 500 error code and display an error page.
> Finally, update the web UI to display startup progress, like HDFS-4249. 
> Filing this for branch-1. Need to check what if anything is available or improved in branch-2 and master.



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