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https://issues.apache.org/jira/browse/HADOOP-15502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16494539#comment-16494539
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Suma Shivaprasad commented on HADOOP-15502:
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This issue is seen when NameNode/DN etc are configured to write to
HadoopTimelineMetricsSink by external tools like Ambari and this fails starting
up NN/DN in the upgraded version.
> Rolling upgrade from HADOOP 2.x to 3.x breaks due to backward in-compatible
> change in MetricsPlugin interface
> -------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-15502
> URL: https://issues.apache.org/jira/browse/HADOOP-15502
> Project: Hadoop Common
> Issue Type: Task
> Reporter: Suma Shivaprasad
> Priority: Major
>
> HADOOP-13660 breaks backward compatibility due to API changes in
> MetricsPlugin. This also breaks rolling upgrades since any client
> implementing this - like HadoopTimelineMetricsSink in Ambari is affected -
> see https://issues.apache.org/jira/browse/AMBARI-20156.
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