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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4383) Add standard interface/methods for all services to query IPC and HTTP addresses and ports
Date Mon, 01 Jun 2009 14:07:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715088#action_12715088

Todd Lipcon commented on HADOOP-4383:

Hey Steve,

I see this and the service lifecycle interface as orthogonal tasks. Making services extend
an interface is important if you want to use some sort of Java-based container to handle cluster
lifecycle management (the "choreography of booting" as you nicely described it). There are
some people, however, who already do this choreography using some different external (non-Java)
tools where that common Java interface is unnecessary (for example, using unix tools to manage
the services via init scripts).

Regarding the J2EE pattern, I think Jeff was just pointing it out as an example of this pattern
that we should look to for inspiration rather than suggesting any actual integration of parts
of the J2EE stack.


> 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

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