Uma Maheswara Rao G created HDFS-15427:
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Summary: Merged ListStatus with Fallback target filesystem and
InternalDirViewFS.
Key: HDFS-15427
URL: https://issues.apache.org/jira/browse/HDFS-15427
Project: Hadoop HDFS
Issue Type: Sub-task
Components: viewfs
Affects Versions: 3.2.1
Reporter: Uma Maheswara Rao G
Assignee: Uma Maheswara Rao G
Currently ListStatus will not consider fallback directory when passed path is
an internal Directory(except root).
Since we configured fallback, we should be able to list fallback directories
when passed path is internal directory. It should list the union of fallbackDir
and internalDir.
So, that fallback directories will not be shaded when path matched to internal
dir.
The idea here is, user configured default filesystem with fallback fs, then
every operation not having link should go to fallback fs. That way users need
not configure all paths as mount from default fs.
This will be very useful in the case of ViewFSOverloadScheme.
In ViewFSOverloadScheme, if you choose your existing cluster to be configured
as fallback fs, then you can configure desired mount paths to external fs and
rest other path should go to fallback.
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