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https://issues.apache.org/jira/browse/HDFS-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-2524:
------------------------------

    Issue Type: Improvement  (was: Sub-task)
        Parent:     (was: HDFS-1623)
    
> HA: Simple HealthMonitor class to watch an HAService
> ----------------------------------------------------
>
>                 Key: HDFS-2524
>                 URL: https://issues.apache.org/jira/browse/HDFS-2524
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-2524.txt
>
>
> This is a utility class which will be part of the FailoverController. The 
> class starts a daemon thread which periodically monitors an HAService, 
> calling its monitorHealth function. It then generates callbacks into another 
> class when the health status changes (eg the RPC fails or the service returns 
> a HealthCheckFailedException)

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