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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4198) DFSClient should do lease recovery using data transfer port.
Date Thu, 18 Sep 2008 00:05:44 GMT
DFSClient should do lease recovery using data transfer port.

                 Key: HADOOP-4198
                 URL: https://issues.apache.org/jira/browse/HADOOP-4198
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.18.0
            Reporter: Konstantin Shvachko
            Assignee: Tsz Wo (Nicholas), SZE
            Priority: Blocker
             Fix For: 0.18.1

HADOOP-3283 introduced {{dfs.datanode.ipc.address}} which defines where the data-node rpc
server runs.
The rpc server on a data-node is used only for lease recovery (HADOOP-3310).
Lease recovery can be initialized by a name-node or by a client.
The problem was reported if lease recovery is initialized by a client running on an untrusted
The port that the http server runs on is closed for the outside use and therefore lease recovery
Production level security model assumes that data-nodes are run on trusted nodes and therefore
it is safe to have ports open for inter data-node communication.
HDFS clients can run on arbitrary nodes and according to the security model can access only
the ports that are externally open.
We propose to use the standard data node port for lease recovery, which means that lease recovery
will use {{DataXceiver}} and data transfer protocol rather than {{ClientDatanodeProtocol}}.

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