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https://issues.apache.org/jira/browse/HDFS-326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733241#action_12733241
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Steve Loughran commented on HDFS-326:
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Hi Chris
I've been on vacation, but yes, I know this will be work. something like
-create the patch by diffing the branch with the relevant version of the old
trunk
-apply the relevant bits of the patch to each branch
-handle the ongoing changes
-test everything
-create separate issues for each branch
Splitting the project into 3 has probably made cross-section patches trickier.
You will know if you have a change to MR that it wont impact core or dfs, but
not the other way around.
> Add a lifecycle interface for Hadoop components: namenodes, job clients, etc.
> -----------------------------------------------------------------------------
>
> Key: HDFS-326
> URL: https://issues.apache.org/jira/browse/HDFS-326
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: AbstractHadoopComponent.java, HADOOP-3628-18.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch, hadoop-3628.patch,
> hadoop-3628.patch, hadoop-lifecycle-tomw.sxw, hadoop-lifecycle.pdf,
> hadoop-lifecycle.sxw
>
>
> I'd like to propose we have a standard interface for hadoop components, the
> things that get started or stopped when you bring up a namenode. currently,
> some of these classes have a stop() or shutdown() method, with no standard
> name/interface, but no way of seeing if they are live, checking their health
> of shutting them down reliably. Indeed, there is a tendency for the spawned
> threads to not want to die; to require the entire process to be killed to
> stop the workers.
> Having a standard interface would make it easier for
> * management tools to manage the different things
> * monitoring the state of things
> * subclassing
> The latter is interesting as right now TaskTracker and JobTracker start up
> threads in their constructor; that's very dangerous as subclasses may have
> their methods called before they are full initialised. Adding this interface
> would be the right time to clean up the startup process so that subclassing
> is less risky.
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