[jira] [Created] (HADOOP-17024) ListStatus on ViewFS root (ls "/") should list the linkFallBack root (configured target root).

["Uma Maheswara Rao G (Jira)" <ji...@apache.org>]

Uma Maheswara Rao G created HADOOP-17024:
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             Summary: ListStatus on ViewFS root (ls "/") should list the linkFallBack root (configured target root).
                 Key: HADOOP-17024
                 URL: https://issues.apache.org/jira/browse/HADOOP-17024
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs, viewfs
    Affects Versions: 3.2.2
            Reporter: Uma Maheswara Rao G


As part of the design doc, [~sanjay.radia] and discussed the following scenarios when fallback enabled.

 *Behavior when fallback enabled:*

       Assume FS trees and mount mappings like below:

           mount link /a/b/c/d  → hdfs://nn1/a/b

           mount link /a/p/q/r  → hdfs://nn2/a/b    

           fallback → hdfs://nn3/  $  /a/c
                                                 /x/z
 # Open(/x/y) then it goes to nn3 (fallback)      - WORKS
 # Create(/x/foo) then foo is created in nn3 in dir /x   - WORKS
 # ls /  should list   /a  /x .Today this does not work and IT IS A BUG!!! Because it conflicts with the open(/x/y)
 # Create /y  : fails  - also fails when not using  fallback  - WORKS
 # Create /a/z : fails - also fails when not using  fallback - WORKS
 # ls /a should list /b /p  as expected and will not show fallback in nn3 - WORKS

 

This Jira will fix issue of #3. So, when fallback enabled it should show merged ls view with mount links + fallback root. ( this will only be at root level)



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