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https://issues.apache.org/jira/browse/HADOOP-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063676#comment-13063676
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Suresh Srinivas commented on HADOOP-7455:
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> I think the method name "monitor" could be more descriptive. Perhaps
> something like "getAvailabilityState"?
I am just trying to model it on OCF, where monitor is a way to see if the
service is running/stopped. I did think of returning void when the service is
healthy. But returning state seemed better.
> set of possible values of ServiceState might be too restrictive?
What other values you would add? We could add more later.
> ServiceAvailabilityException
Note that this is not just availability related. In the interface, I was
looking at returning success/error. Both indicated through exit codes. But I
wanted to avoid exit codes and use more descriptive exceptions.
> Introduce HA Service Protocol Interface
> ---------------------------------------
>
> Key: HADOOP-7455
> URL: https://issues.apache.org/jira/browse/HADOOP-7455
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: util
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: HADOOP-7455.1.patch, HDFS-7454.patch
>
>
> This jira introduces a protocol interface to be implemented by services that
> provide HA functionality.
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