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https://issues.apache.org/jira/browse/HADOOP-5257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688851#action_12688851
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Carlos Valiente commented on HADOOP-5257:
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bq.My other issue is that there are some very hard coded assumption that this
code is limited to the filesystem. As doug says, a ServicePlugin would be more
generic. You'd have to have separate classes for the NamenodeServicePlugin and
the DatanodeServicePlugin, but you wouldn't need more interfaces when you came
to add support for TaskTracker, JobTracker, Pig, etc.
The attachment [^HADOOP-5257-v8.patch] already addresses that, I think
> Export namenode/datanode functionality through a pluggable RPC layer
> --------------------------------------------------------------------
>
> Key: HADOOP-5257
> URL: https://issues.apache.org/jira/browse/HADOOP-5257
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Carlos Valiente
> Priority: Minor
> Attachments: HADOOP-5257-v2.patch, HADOOP-5257-v3.patch,
> HADOOP-5257-v4.patch, HADOOP-5257-v5.patch, HADOOP-5257-v6.patch,
> HADOOP-5257-v7.patch, HADOOP-5257-v8.patch, HADOOP-5257.patch
>
>
> Adding support for pluggable components would allow exporting DFS
> functionallity using arbitrary protocols, like Thirft or Protocol Buffers.
> I'm opening this issue on Dhruba's suggestion in HADOOP-4707.
> Plug-in implementations would extend this base class:
> {code}abstract class Plugin {
> public abstract datanodeStarted(DataNode datanode);
> public abstract datanodeStopping();
> public abstract namenodeStarted(NameNode namenode);
> public abstract namenodeStopping();
> }{code}
> Name node instances would then start the plug-ins according to a
> configuration object, and would also shut them down when the node goes down:
> {code}public class NameNode {
> // [..]
> private void initialize(Configuration conf)
> // [...]
> for (Plugin p: PluginManager.loadPlugins(conf))
> p.namenodeStarted(this);
> }
> // [..]
> public void stop() {
> if (stopRequested)
> return;
> stopRequested = true;
> for (Plugin p: plugins)
> p.namenodeStopping();
> // [..]
> }
> // [..]
> }{code}
> Data nodes would do a similar thing in {{DataNode.startDatanode()}} and
> {{DataNode.shutdown}}
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