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https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638367#action_12638367
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Konstantin Shvachko commented on HADOOP-4044:
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I understand your answer to my question [HADOOP-4044#action_12638156] is that
_this argument is about the programming style_
rather than performance or anything else. Or do you call differently?
Qouting one of the links you provide
"Checked exceptions : represent invalid conditions in areas outside the
immediate control of the program"
If a program cannot cannot handle some condition it throws a checked exception.
So the question of whether the value of a link is normal data is actually
program layer-dependent.
- Can it be handled within the name-node. Yes for local links - handle them. No
for external links. Throw the exception.
- Can it be handled by ClientProtocol. No. Throw the exception.
- Can it be handled by DFSClient. No. Throw the exception.
- Can it be handled by DistributedFileSystem. No. Throw the exception.
- Can it be handled by FileSystem. Yes! because FileSystem cashes file system
implementations.
FileSystem is the first layer for which link values make sense.
> 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, symLink4.patch,
> symLink5.patch, symLink6.patch, symLink8.patch, symLink9.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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