[HADOOP-6996] Allow CodecFactory to return a codec object given a codec' class name

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.22.0
• Component/s: io
• Hadoop Flags: Reviewed
• Assignee: Hairong Kuang
• Reporter: Hairong Kuang
• Created: 11/Oct/10 18:30
• Updated: 12/Dec/11 06:18
• Resolved: 28/Oct/10 23:48

Description

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.

Issue Links

• blocks: HDFS-1435 Provide an option to store fsimage compressed