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Message-ID: <4191358.98271286902173375.JavaMail.jira@thor>
Date: Tue, 12 Oct 2010 12:49:33 -0400 (EDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6996) Allow CodecFactory to return a
 codec object given a codec' class name
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    [ https://issues.apache.org/jira/browse/HADOOP-6996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12920254#action_12920254 ] 

Hairong Kuang commented on HADOOP-6996:
---------------------------------------

You are right. But before I add the default class constructor, there was a possibility that codecClassName is null. Now I realize that adding the default constructor is an incompatible change. Let me revert this change by deleting the 2nd patch: getCodecByClassName1.patch.

> Allow CodecFactory to return a codec object given a codec' class name
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-6996
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6996
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>    Affects Versions: 0.22.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.22.0
>
>         Attachments: getCodecByClassName.patch
>
>
> CodecFactory specify the list of codec that are supported by Hadoop. However, it returns a codec only by a file's name. I would like to make getCodec method to alternatively take a codec's class name.
> This is required by  HDFS-1435, where
> 1. it allows an HDFS admin to configure which codec to use to save an image. 
> 2. It stores the codec class name in its on-disk image instead of a file's suffix.
> When saving and reading an image, I'd like to get an codec from CodecFactory by its class name. 

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