[jira] [Commented] (HADOOP-18193) Support nested mount points in INodeTree

["Virajith Jalaparti (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-18193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17523913#comment-17523913 ] 

Virajith Jalaparti commented on HADOOP-18193:
---------------------------------------------

Hi [~umamaheswararao], [~ayushtkn], [~vinayakumarb] can one of you help review this PR?

> Support nested mount points in INodeTree
> ----------------------------------------
>
>                 Key: HADOOP-18193
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18193
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: viewfs
>    Affects Versions: 2.10.0
>            Reporter: Lei Yang
>            Assignee: Lei Yang
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> Defining following client mount table config is not supported in  INodeTree and will throw FileAlreadyExistsException
> fs.viewfs.mounttable.link./foo/bar=hdfs://nn1/foo/bar
> fs.viewfs.mounttable.link./foo=hdfs://nn02/foo
>  
> INodeTree has 2 methods that need change to support nested mount points.
> createLink(..): build INodeTree during fs init.
> resolve(..): resolve path in INodeTree with viewfs apis.
>  
> ViewFileSystem and ViewFs referes INodeTree.resolve(..) to resolve path to specific mount point. No changes are expected in both classes. However, we need to support existing use cases and make sure no regression are caused.
>  
> AC:
>  # INodeTree.createlink should support creating nested mount points.(INodeTree is constructed during fs init)
>  # INodeTree.resolve should support resolve path based on nested mount points. (INodeTree.resolve is used in viewfs apis)
>  # No regression in existing ViewFileSystem and ViewFs apis.
>  # Ensure some important apis are not broken with nested mount points. (Rename, getContentSummary, listStatus...)



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