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https://issues.apache.org/jira/browse/HADOOP-4383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715080#action_12715080
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Steve Loughran commented on HADOOP-4383:
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Jeff, HADOOP-3628 adds a common base class for services, I am busy running the
tests to see that it works with SVN_HEAD.
The ServiceLocator patten in J2EE is subtly different as J2EE is pretty weak
with most aspects of operations; we also have to deal with the choreography
problems of booting a large cluster, in which the ops team reserve the right to
move stuff in order to maintain availability.
This is something I can help with, getting that base lifecycle stuff in there
would be the first step. Then we can deal with binding/rebinding and config.
Oh, and all the tests.
> Add standard interface/methods for all services to query IPC and HTTP
> addresses and ports
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-4383
> URL: https://issues.apache.org/jira/browse/HADOOP-4383
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs, mapred
> Affects Versions: 0.20.0
> Reporter: Steve Loughran
> Priority: Minor
>
> This is something I've ended up doing in subclasses of all the services:
> methods to get at the IPC and HTTP port and addresses. Some services have
> exported methods for this (JobTracker), others package-private member
> variables (namenode), while others don't allow you to get at all the data
> (Datanode keeps the http server private).
> A uniform way to query any service for its live port and address values make
> some aspects of service management much easier, such as feeding those values
> in to http page monitoring tools.
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