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https://issues.apache.org/jira/browse/HADOOP-7788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154718#comment-13154718
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Suresh Srinivas commented on HADOOP-7788:
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Comments:
# SERVICE_UNHEALTHY_NOT_RESPONDING - do we have SERVICE_HEALTHY_NOT_RESPONDING?
If not, we should call this SERVICE_NOT_RESPONDING.
# Please add javadoc to HealthMonitor class and annotations
# Should we document what can be done in callback? Can it take a long time etc.?
# In order to keep the interface complete, it may be a good idea to add
removeCallBack(). I cannot think of a use for this, right now though.
# CHECK_INTERVAL_DEFAULT is 5 seconds - it would be better do this in shorter
duration. Say 1s?
# With tests added main() method seems unnecessary.
> 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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