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From "Andrei Savu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (WHIRR-221) Optionally control the order of starting services
Date Fri, 03 Feb 2012 18:19:57 GMT

    [ https://issues.apache.org/jira/browse/WHIRR-221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199920#comment-13199920
] 

Andrei Savu commented on WHIRR-221:
-----------------------------------

bq. Still, do you think we should ignore missing dependencies?

You are right! As long we allow the user to override the dependencies graph we should fail
fast if any of the requested dependencies is missing with a helpful error message. 

PS: nice work! I'm happy that we should be able to add this feature soon. It should make the
deployment more robust.
                
> 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
>            Reporter: Andrei Savu
>            Assignee: David Alves
>            Priority: Critical
>             Fix For: 0.8.0
>
>         Attachments: WHIRR-221-v1.patch, WHIRR-221-v3.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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