[HDFS-4946] Allow preferLocalNode in BlockPlacementPolicyDefault to be configurable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0-alpha, 2.7.2, 3.0.0-alpha1
• Fix Version/s: 2.8.0, 2.7.3, 3.0.0-alpha1
• Component/s: namenode
• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Nathan Roberts
• Reporter: James Kinley
• Created: 01/Jul/13 09:53
• Updated: 06/Jan/17 00:59
• Resolved: 18/Feb/16 20:12

Description

Allow preferLocalNode in BlockPlacementPolicyDefault to be disabled in configuration to prevent clients from writing the first replica of every block (i.e. the entire file) to the local DataNode.

Issue Links

• duplicates: HDFS-3702 Add an option for NOT writing the blocks locally if there is a datanode on the same box as the client
• relates to: HDFS-3702 Add an option for NOT writing the blocks locally if there is a datanode on the same box as the client