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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9933) Augment Service model to support starting stopped services
Date Mon, 09 Sep 2013 17:06:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762039#comment-13762039
] 

Sandy Ryza commented on HADOOP-9933:
------------------------------------

It looks like Guava doesn't allow its services to be restarted (ref: http://stackoverflow.com/questions/8976367/restartable-service-using-guava).
 Do we know any of the reasons they went with this design choice?
                
> Augment Service model to support starting stopped services
> ----------------------------------------------------------
>
>                 Key: HADOOP-9933
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9933
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.1.0-beta
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>              Labels: service
>
> For ResourceManager-HA (YARN-149 and co), we would want to start/stop/start RM's active
services as it transitions to Active/Standby/Active respectively. In the current service model,
we can't start the services that are already stopped.
> Would be nice to augment this. To avoid accidental restart of stopped services, we can
add another API: start(boolean restartIfStopped). Thoughts?

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