Details
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Improvement
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Status: Patch Available
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Major
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Resolution: Unresolved
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None
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None
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2.6.0-cdh5.10.0
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Reviewed
Description
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>