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Date: Thu, 17 Sep 2009 17:11:57 -0700 (PDT)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-245) Create symbolic links in HDFS
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    [ https://issues.apache.org/jira/browse/HDFS-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756874#action_12756874 ] 

Doug Cutting commented on HDFS-245:
-----------------------------------

> Also, is there any performance difference between throwing an exception vs returning a status code? 

Java exceptions are substantially slower than normal returns.

I can't find a lot of benchmarks, but here's one that says its 66x slower!

http://stackoverflow.com/questions/299068/how-slow-are-java-exceptions/299315


> Create symbolic links in HDFS
> -----------------------------
>
>                 Key: HDFS-245
>                 URL: https://issues.apache.org/jira/browse/HDFS-245
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: dhruba borthakur
>            Assignee: Eli Collins
>         Attachments: 4044_20081030spi.java, HADOOP-4044-strawman.patch, symlink-0.20.0.patch, symLink1.patch, symLink1.patch, symLink11.patch, symLink12.patch, symLink13.patch, symLink14.patch, symLink15.txt, symLink15.txt, 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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