Erik Krogen created HADOOP-14136:
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Summary: Default FS For ViewFS
Key: HADOOP-14136
URL: https://issues.apache.org/jira/browse/HADOOP-14136
Project: Hadoop Common
Issue Type: Improvement
Components: viewfs
Reporter: Erik Krogen
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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