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https://issues.apache.org/jira/browse/HDFS-2760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181344#comment-13181344
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Denny Ye commented on HDFS-2760:
--------------------------------
I took this demo in local. NameNode proxy object take the role for actual
NameNode at NN RPC server. It only record and transfer the method invocation
request to actual NameNode object, and does not need additional RPC call.
You said right, but it's not a good solution for all clients that they need
namespace notification and handle log parser respectively. Likewise, same
function appear at Linux kernel.
> HDFS notification
> ------------------
>
> Key: HDFS-2760
> URL: https://issues.apache.org/jira/browse/HDFS-2760
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 0.20.2
> Reporter: Denny Ye
> Priority: Minor
> Labels: HDFS
>
> Client would like to receive the interested namespace operation at HDFS,
> likes 'rename', 'block allocation' and so on. NameNode should support the
> changing notification to client with appropriate way.
> In my opinion, I suggest the notification should be applied between NameNode
> RPC server and actual NameNode object (it's proxy for NameNode object).
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