Move http server from FSNamesystem into NameNode.
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Key: HADOOP-4618
URL: https://issues.apache.org/jira/browse/HADOOP-4618
Project: Hadoop Core
Issue Type: Bug
Affects Versions: 0.1.0
Reporter: Konstantin Shvachko
Assignee: Konstantin Shvachko
Fix For: 0.20.0
NameNode is responsible now for starting its RPC server. The (web UI) http
server is started inside FSNamesystem class.
I think it should be the NameNode's responsibility to deal with all issues
intended for exposing information it holds to the outside world. This should
include the RCP server as well as the http server.
And FSNamesystem class should be a logical container of internal namespace
data-structures and in general should not be accessed directly from the outside.
I came to this conclusion trying to implement a standby node. SNN and NN should
be represented by the same class, since one can turn into another and vice
versa during their life time. I realized that with current implementation the
node startup logic will be spread between two classes ({{NameNode}} and
{{FSNamesystem}}), which is inconvenient, complex, and error prone.
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