[HDFS-6680] BlockPlacementPolicyDefault does not choose favored nodes correctly

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.5.0
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Tsz-wo Sze
• Reporter: Tsz-wo Sze
• Created: 15/Jul/14 01:07
• Updated: 15/Aug/14 05:41
• Resolved: 21/Jul/14 23:27

Description

In one of the chooseTarget(..) methods, it tries all the favoredNodes to chooseLocalNode(..). It expects chooseLocalNode to return null if the local node is not a good target. Unfortunately, chooseLocalNode will fallback to chooseLocalRack but not returning null.

Issue Links

• relates to: HDFS-2576 Namenode should have a favored nodes hint to enable clients to have control over block placement.