luoge123 created HDFS-12555:
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Summary: HDFS federation should support configure secondary
directory
Key: HDFS-12555
URL: https://issues.apache.org/jira/browse/HDFS-12555
Project: Hadoop HDFS
Issue Type: Improvement
Components: federation
Reporter: luoge123
HDFS federation support multiple namenodes horizontally scales the file system
namespace. As the amount of data grows, using a single group of namenodes to
manage a single directory, namenode still achieves performance bottlenecks. In
order to reduce the pressure of namenode, we can split out the secondary
directory, and manager it by a new namenode. This is transparent for users.
For example, nn1 only manager the /user directory, when nn1 achieve performance
bottlenecks, we can split out /user/hive directory, and ues nn2 to manager it.
That means core-site.xml should support as follows configuration.
<property>
<name>fs.viewfs.mounttable.nsX.link./user</name>
<value>hdfs://nn1:8020/user</value>
</property>
<property>
<name>fs.viewfs.mounttable.nsX.link./user/hive</name>
<value>hdfs://nn2:8020/user/hive</value>
</property>
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