[HDFS-2562] Refactor DN configuration variables out of DataNode class

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.23.1, 2.0.0-alpha
• Fix Version/s: 0.23.1
• Component/s: datanode
• Target Version/s: 0.23.0
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 18/Nov/11 00:48
• Updated: 10/Mar/15 04:35
• Resolved: 18/Nov/11 09:04

Description

Right now there are many member variables in DataNode.java which are just read from configuration when the DN is started. Similar to what we did with DFSClient, we should refactor them into a new DNConf class which can be passed around - the motivation is to remove the many references we have throughout the code that read package-protected members of DataNode and reduce the number of members in DataNode itself.