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https://issues.apache.org/jira/browse/HDFS-7257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14182199#comment-14182199
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Haohui Mai commented on HDFS-7257:
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I'll commit it shortly.
> Add the time of last HA state transition to NN's /jmx page
> ----------------------------------------------------------
>
> Key: HDFS-7257
> URL: https://issues.apache.org/jira/browse/HDFS-7257
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Charles Lamb
> Assignee: Charles Lamb
> Priority: Minor
> Attachments: HDFS-7257.001.patch, HDFS-7257.002.patch,
> HDFS-7257.003.patch, HDFS-7257.004.patch, HDFS-7257.005.patch,
> HDFS-7257.006.patch
>
>
> It would be useful to some monitoring apps to expose the last HA transition
> time in the NN's /jmx page.
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