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https://issues.apache.org/jira/browse/HDFS-14020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko resolved HDFS-14020.
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Resolution: Duplicate
Resolving as duplicate since HDFS-13873 introduced {{testObserverFallBehind()}}
in {{TestMultiObserverNode}}, which serves the purpose. This has also been
already tested on live clusters.
> Emulate Observer node falling far behind the Active
> ---------------------------------------------------
>
> Key: HDFS-14020
> URL: https://issues.apache.org/jira/browse/HDFS-14020
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Sherwood Zheng
> Assignee: Sherwood Zheng
> Priority: Major
>
> Emulate Observer node falling far behind the Active. Ensure readers switch
> over
> to another Observer instead of waiting for the lagging Observer to catch up.
> If
> there is only a single Observer, it should fall back to the Active.
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