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https://issues.apache.org/jira/browse/HADOOP-14136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HADOOP-14136 started by Manoj Govindassamy.
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> Default FS For ViewFS
> ---------------------
>
> Key: HADOOP-14136
> URL: https://issues.apache.org/jira/browse/HADOOP-14136
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs, viewfs
> Reporter: Erik Krogen
> Assignee: Manoj Govindassamy
>
> It would be useful if ViewFS had the ability to designate one FileSystem as a
> "primary"/"default" to fall back to in the case that an entry in the mount
> table is not found. Consider the situation when you have a mount table that
> looks like:
> {code}
> /data -> hdfs://nn1/data
> /logs -> hdfs://nn1/logs
> /user -> hdfs://nn1/user
> /remote -> hdfs://nn2/remote
> {code}
> {{nn1}} here is being used as the primary, with a specific directory 'remote'
> being offloaded to another namenode. This works, but if we want to add
> another top-level directory to {{nn1}}, we have to update all of our
> client-side mount tables. Merge links (HADOOP-8298) could be used to achieve
> this but they do not seem to be coming soon; this special case of a default
> FS is much simpler - try to resolve through the VFS mount table, if not
> found, then resolve to the defaultFS.
> There is a good discussion of this at
> https://issues.apache.org/jira/browse/HADOOP-13055?focusedCommentId=15733822&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15733822
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