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https://issues.apache.org/jira/browse/HBASE-18520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118016#comment-16118016
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stack commented on HBASE-18520:
-------------------------------

So, it looks like this patch was backported to branch-2 and branch-1 but not 
branch-1.4. I was confused because no note was left in here saying what 
branches had been picked too which is our usual practice. I did a bunch of mess 
trying to cherry-pick. I think its fixed now; i.e. backported back to 1.4.

> Add jmx value to determine true Master Start time
> -------------------------------------------------
>
>                 Key: HBASE-18520
>                 URL: https://issues.apache.org/jira/browse/HBASE-18520
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Zach York
>            Assignee: Zach York
>            Priority: Minor
>             Fix For: 3.0.0, 1.4.0, 2.0.0-alpha-2
>
>         Attachments: HBASE-18520.branch-1.001.patch, 
> HBASE-18520.branch-1.002.patch, HBASE-18520.master.001.patch, 
> HBASE-18520.master.002.patch, HBASE-18520.master.003.patch
>
>
> The masterActiveTime is being set before regions are assigned. This patch 
> adds a new jmx metric to expose the final time when the master has become the 
> active master (All regions are assigned, etc.).



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