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https://issues.apache.org/jira/browse/MAPREDUCE-3995?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated MAPREDUCE-3995:
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Attachment: MAPREDUCE-3995.patch
First pass for review -no tests.
This is designed to be as simple as possible -the same service listener is used
for the "global" listeners, and the notifications are blocking on state
changes. I started to write something asynchronous but it was over-complex,
hard to test and could easily leak threads.
The global listener list is synchronised on the list itself, both for changes
and for the list run through itself. Listeners must not attempt to unregister
themselves during a callback or the iterator will fail.
> Add support for static service lifecycle listeners .
> -----------------------------------------------------
>
> Key: MAPREDUCE-3995
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3995
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mrv2
> Affects Versions: 0.23.1, 0.24.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Attachments: MAPREDUCE-3995.patch
>
>
> Add support to {{AbstractService}} that allow callers to register listeners
> for all instances. The existing listener interface could be used. This allows
> management tools to hook into the events.
> The static listeners would be invoked for all state changes except creation
> (base class shouldn't be handing out references to itself at this point).
> These static events could all be async, pushed through a shared
> {{ConcurrentLinkedQueue}}; failures logged at warn and the rest of the
> listeners invoked.
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