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https://issues.apache.org/jira/browse/HADOOP-7788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144434#comment-13144434
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Eli Collins commented on HADOOP-7788:
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Nit, I'd have the first state be SERVICE_HEALTH_UNKNOWN rather than
INITIALIZING so the value of state always refers to the state of the service
being monitored.
Otherwise +1, looks good.
> HA: Simple HealthMonitor class to watch an HAService
> ----------------------------------------------------
>
> Key: HADOOP-7788
> URL: https://issues.apache.org/jira/browse/HADOOP-7788
> Project: Hadoop Common
> Issue Type: Sub-task
> 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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