zhuxiangyi commented on a change in pull request #2981:
URL: https://github.com/apache/hadoop/pull/2981#discussion_r628667273
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File path:
hadoop-hdfs-project/hadoop-hdfs-rbf/src/site/markdown/HDFSRouterFederation.md
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@@ -241,6 +241,22 @@ Mount table permission can be set by following command:
The option mode is UNIX-style permissions for the mount table. Permissions are
specified in octal, e.g. 0755. By default, this is set to 0755.
+#### Init ViewFs To Router
+Router supports initializing the ViewFS mount point to the Router. The mapping
directory protocol of ViewFS must be HDFS, and the initializer only supports
one-to-one mapping.
+
+For example, use the following viewfs to configure the initial mount table to
the router.
+
+ <configuration>
+ <property>
+ <name>fs.viewfs.mounttable.ClusterX.link./data</name>
+ <value>hdfs://nn1-clusterx.example.com:8020/data</value>
+ </property>
+ </configuration>
+
+The ViewFS mount table can be initialized to the Router by using the following
command:
+
+ [hdfs]$ $HADOOP_HOME/bin/hdfs dfsrouteradmin -initViewFsToMountTable
ClusterX
Review comment:
Do you mean that there are mount points for multiple clusters, can the
user import all of them without specifying the cluster name? For example, the
following configuration.
<configuration>
<property>
<name>fs.viewfs.mounttable.ClusterX.link./data</name>
<value>hdfs://nn1-clusterx.example.com:8020/data</value>
</property>
<property>
<name>fs.viewfs.mounttable.ClusterY.link./project</name>
<value>hdfs://nn2-clusterx.example.com:8020/project</value>
</property>
</configuration>
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