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https://issues.apache.org/jira/browse/HDFS-12555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201110#comment-16201110
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Bharat Viswanadham edited comment on HDFS-12555 at 10/11/17 11:37 PM:
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Hi [~luoge123]
In the property fs.viewfs.mounttable.nsX.link.<<path>> the link is virtual, so
we can configure as below and achieve the samething currently right?
<property>
<name>fs.viewfs.mounttable.nsX.link./virtual</name>
<value>hdfs://nn2:8020/user/hive</value>
</property>
Please let me know if i am missing something?
was (Author: bharatviswa):
Hi [~luoge123]
In the property s.viewfs.mounttable.nsX.link.<<path>> the link is virtual, so
we can configure as below and achieve the samething currently right?
<property>
<name>fs.viewfs.mounttable.nsX.link./virtual</name>
<value>hdfs://nn2:8020/user/hive</value>
</property>
Please let me know if i am missing something?
> 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
> Environment: 2.6.0-cdh5.10.0
> Reporter: luoge123
> Fix For: 2.6.0
>
> Attachments: HDFS-12555.001.patch
>
>
> 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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