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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6996) Allow CodecFactory to return a codec object given a codec' class name
Date Tue, 12 Oct 2010 16:49:33 GMT

    [ 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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