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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