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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4044) Create symbolic links in HDFS
Date Thu, 30 Oct 2008 19:02:47 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE updated HADOOP-4044:
-------------------------------------------

    Attachment: 4044_20081030spi.java

FsResult can be divided into two classes since there are two kind of results, Writables (e.g.
FsResult<BooleanWritable>) and non-writables (e.g. FSDataOutputStreamLink).  I suggest
the following layout:
{code}
public class FsResult<T> implements FSLinkable {
  ...
}

public class FsResultWritable<T extends Writable> extends FsResult<T> implements
Writable {
  ...
}
{code}
Methods like appendImpl(...) should return FsResult<FSDataOutputStream> and methods
like setReplication(...) should return FsResultWritable<BooleanWritable>.

Then, we don't need classes like FSDataInputStreamLink and FSDataOutputStreamLink.  We also
probably don't need FSLinkable anymore.

4044_20081030spi.java shows the complete source codes for FsResult and FsResultWritable. 
I have not removed FSLinkable yet.


> 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: 4044_20081030spi.java, HADOOP-4044-strawman.patch, symLink1.patch,
symLink1.patch, symLink11.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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