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https://issues.apache.org/jira/browse/HADOOP-17024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G updated HADOOP-17024:
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Description:
As part of the design doc HDFS-15289, [~sanjay.radia] and me 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)
was:
As part of the design doc HDFS-15289, [~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)
> 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
> Priority: Major
>
> As part of the design doc HDFS-15289, [~sanjay.radia] and me 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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