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https://issues.apache.org/jira/browse/HADOOP-4383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714489#action_12714489
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Jeff Hammerbacher commented on HADOOP-4383:
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Hey Todd,
Leveraging a "core J2EE pattern"
(http://java.sun.com/blueprints/corej2eepatterns/Patterns/ServiceLocator.html)
to make services inherit from a common interface sounds like a great idea! It
should simplify service management considerably. Go for it.
Later,
Jeff
> 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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