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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4044) Create symbolic links in HDFS
Date Mon, 08 Sep 2008 18:21:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629246#action_12629246
] 

Doug Cutting commented on HADOOP-4044:
--------------------------------------

I think a better API might be:

{code}
public FSDataInputStream open(Path f, int bufferSize) throws IOException {
  FileSystem fs = this;
  FileStatus stat = fs.getFileStatus(f);
  for (stat.isSymLink()) {
    f = stat.getSymLink();
    fs = f.getFileSystem(getConf());
    stat = fs.getStatus(f);
   }
  return fs.openData(stat, bufferSize);
}

public abstract FSDataInputStream openData(FileStatus stat, int bufferSize) throws IOException;
{code}

We could, for back-compatibility, have openData() default to calling open() for one release,
but I think most if not all FileSystem implementations are included in Hadoop, so we're mostly
concerned about client back-compatibilty here, not implementation back-compatibility.

Also, FileStatus#getSymLink() should return a Path, not a String, no?

> 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
>
>
> 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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