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Posted to common-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2009/04/03 07:47:13 UTC
[jira] Commented: (HADOOP-5257) Export namenode/datanode
functionality through a pluggable RPC layer
[ https://issues.apache.org/jira/browse/HADOOP-5257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695249#action_12695249 ]
dhruba borthakur commented on HADOOP-5257:
------------------------------------------
I have committed this patch. Thanks Carlos!
Can some admin please re-assign this patch to Carlos?
> 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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