[HDFS-6846] NetworkTopology#sortByDistance should give nodes higher priority, which cache the block.

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.6.0
• Component/s: namenode
• Assignee: Yi Liu
• Reporter: Yi Liu
• Created: 13/Aug/14 06:35
• Updated: 06/Jan/17 22:07

Description

Currently there are 3 weights:

• local
• same rack
• off rack

But if some nodes cache the block, then it's faster if client read block from these nodes. So we should have some more weights as following:

• local
• cached & same rack
• same rack
• cached & off rack
• off rack