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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Tue, 07 Oct 2008 00:21:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637319#action_12637319
] 

Konstantin Shvachko commented on HADOOP-4044:
---------------------------------------------

> public class FsReturnType<T> 

Interesting idea. You will rather have something like
{code}
public class FSReturnType<T extends Writable> implements Writable {
  public T getValue();
  Path getLink() throws IOException;
}
{code}
And implement serialization methods, and think how to define WritableFactory for the parametrized
class.
And then the protocol methods will look like this
{code}
public FSReturnType<BooleanWritable> setReplication(String src,...); 
{code}

This is better than creating a new class for every new return type, but seems rather complex
compared to one new protocol method plus the UnresolvedPathException that I was proposing.

> 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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