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https://issues.apache.org/jira/browse/HADOOP-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637702#action_12637702
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Konstantin Shvachko commented on HADOOP-4044:
---------------------------------------------
Doug> whether to use an exception or a data structure to pass the return value.
!!! No need to pass the return value with the exception !!!
{code}
public FileHandle open(Path path) {
while(path != null) {
try {
return open(path); // succeeds if there are no links in the path
} catch (XMountPointException eX) { // called only if the mount point is
crossed
path = getLinkTarget(path);
}
}
}
{code}
There is no need to change api with this. Only add a new method getLinkTarget().
And XMountPointException does not encode or pass any values.
> 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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