[jira] Commented: (HDFS-326) Add a lifecycle interface for Hadoop components: namenodes, job clients, etc.

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733241#action_12733241 ] 

Steve Loughran commented on HDFS-326:
-------------------------------------

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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