[HDFS-2223] Untangle depencencies between NN components

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.0
• Fix Version/s: 2.0.0-alpha
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 03/Aug/11 21:09
• Updated: 28/Sep/15 20:58
• Resolved: 07/Sep/11 23:24

Description

Working in the NN a lot for HA (HDFS-1623) I've come across a number of situations where the tangled dependencies between NN components has been problematic for adding new features and for testability. It would be good to untangle some of these and clarify what the distinction is between the different components: NameNode, FSNamesystem, FSDirectory, FSImage, NNStorage, and FSEditLog