Datanode should be able to register multiple network interfaces
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Key: HDFS-3146
URL: https://issues.apache.org/jira/browse/HDFS-3146
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node
Reporter: Eli Collins
Assignee: Eli Collins
The Datanode should register multiple interfaces with the Namenode (who then
forwards them to clients). We can do this by extending the DatanodeID, which
currently just contains a single interface, to contain a list of interfaces.
For compatibility, the DatanodeID method to get the DN address for data
transfer should remain unchanged (multiple interfaces are only used where the
client explicitly takes advantage of them).
By default, if the Datanode binds on all interfaces (via using the wildcard in
the dfs*address configuration) all interfaces are exposed, modulo ones like the
loopback that should never be exposed. Alternatively, a new configuration
parameter ({{dfs.datanode.available.interfaces}}) allows the set of interfaces
can be specified explicitly in case the user only wants to expose a subset. If
the new default behavior is too disruptive we could default
dfs.datanode.available.interfaces to be the IP of the IPC interface which is
the only interface exposed today (per HADOOP-6867, only the port from
dfs.datanode.address is used today).
The interfaces can be specified by name (eg "eth0"), subinterface name (eg
"eth0:0"), or IP address. The IP address can be specified by range using CIDR
notation so the configuration values are portable.
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