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