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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (WHIRR-221) Optionally control the order of starting services
Date Wed, 09 Feb 2011 22:58:57 GMT

    [ https://issues.apache.org/jira/browse/WHIRR-221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992772#comment-12992772

Tom White commented on WHIRR-221:

Thanks for the contribution David. This is great work, but I'm struggling to see the use case
that motivates the feature. It came up in the context of HBase, but HBase works without it
(as far as I know). I'm hesitant to add this code without having at least one service that
uses it. Lars/Andrei, perhaps you can shed some more light? Thanks.

> Optionally control the order of starting services
> -------------------------------------------------
>                 Key: WHIRR-221
>                 URL: https://issues.apache.org/jira/browse/WHIRR-221
>             Project: Whirr
>          Issue Type: New Feature
>          Components: core, documentation
>    Affects Versions: 0.4.0
>            Reporter: Andrei Savu
>            Priority: Critical
>             Fix For: 0.4.0
>         Attachments: WHIRR-221-v1.patch, WHIRR-221.patch
> As Lars sugested in WHIRR-170:
> The user should "be able to optionally control the order (services start). This could
be role based and specified like so
> {code}
> whirr.role-order=zk,nn+jt,dn+tt,hbase-master,hbase-regionserver
> {code}
> If not specified the system should make any effort to start the services as quickly as
possible, for example in multiple threads. In other words, when the role-order is not given
no guarantee about order can be given."

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