[jira] [Commented] (BROOKLYN-208) Config resolution on shutdown

["Sam Corbett (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BROOKLYN-208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15068464#comment-15068464 ] 

Sam Corbett commented on BROOKLYN-208:
--------------------------------------

Mike recently worked on this problem too: https://github.com/apache/incubator-brooklyn/pull/1090. He configured attributeWhenReady to time out after one minute when the target entity is stopping, stopped or destroyed.

> Config resolution on shutdown
> -----------------------------
>
>                 Key: BROOKLYN-208
>                 URL: https://issues.apache.org/jira/browse/BROOKLYN-208
>             Project: Brooklyn
>          Issue Type: Bug
>    Affects Versions: 0.9.0
>            Reporter: Graeme Miller
>            Priority: Minor
>
> Consider a blueprint that has two entities, Entity1 and Entity2. Entity1 has a brooklyn.config value Conf1. Entity2 has a brookyln.config value Conf2, which uses attributeWhenReady to get the value of Conf1.
> When Entity2 is shutting down, it attempts to get Conf2 (for example because it is a 'shell.env' parameter). Brooklyn then creates a task to get the value of Conf1 to populate it, however, Entity1 has already shutdown. Entity2 now waits for the value until a timeout and then cancels resolving Conf2.
> To fix this situation, I would like to suggest that config values should be immutable, I.E. should be resolved once before the entity starts and never again.



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