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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7788) HA: Simple HealthMonitor class to watch an HAService
Date Fri, 04 Nov 2011 22:59:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144434#comment-13144434
] 

Eli Collins commented on HADOOP-7788:
-------------------------------------

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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