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https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630242#action_12630242
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Raghu Angadi commented on HADOOP-4044:
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bq. @Raghu: The FSDataInputStream will implement another interface StreamType
that will store the information on whether this is a symbolc link. No extra RPC
is needed.
Ok, this is one of the options for mentioned earlier that works just for
open(). As the earlier discussions in the Jira shows, symlinks is kind of
fundamental change to filesystem and affects various parts. Just like open(),
once various options for general handling of links is discussed here, I don't
think patch will be much more complicated than what you have attached.
Symlinks have been used for many decades and I don't think there any lack of
use cases. I don't think HADOOP-4058 should alone be the criteria for this
Jira.
> Create symbolic links in HDFS
> -----------------------------
>
> Key: HADOOP-4044
> URL: https://issues.apache.org/jira/browse/HADOOP-4044
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: symLink1.patch, symLink1.patch
>
>
> HDFS should support symbolic links. A symbolic link is a special type of file
> that contains a reference to another file or directory in the form of an
> absolute or relative path and that affects pathname resolution. Programs
> which read or write to files named by a symbolic link will behave as if
> operating directly on the target file. However, archiving utilities can
> handle symbolic links specially and manipulate them directly.
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